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99920017 = 372700541
BaseRepresentation
bin1011111010010…
…10100010010001
320222000110111101
411331022202101
5201034420032
613525344401
72322210001
oct575124221
9228013441
1099920017
115144742a
1229568101
1317916292
14d3b0001
158b8ade7
hex5f4a891

99920017 has 4 divisors (see below), whose sum is σ = 102620596. Its totient is φ = 97219440.

The previous prime is 99919997. The next prime is 99920021. The reversal of 99920017 is 71002999.

It is a Cunningham number, because it is equal to 99962+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71002999 = 174176647.

It can be written as a sum of positive squares in 2 ways, for example, as 89415936 + 10504081 = 9456^2 + 3241^2 .

It is a cyclic number.

It is not a de Polignac number, because 99920017 - 219 = 99395729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 2700541 = 99920017 / (9 + 9 + 9 + 2 + 0 + 0 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99920047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350234 + ... + 1350307.

It is an arithmetic number, because the mean of its divisors is an integer number (25655149).

Almost surely, 299920017 is an apocalyptic number.

It is an amenable number.

99920017 is a deficient number, since it is larger than the sum of its proper divisors (2700579).

99920017 is a wasteful number, since it uses less digits than its factorization.

99920017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700578.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 99920017 is about 9996.0000500200. Note that the first 4 decimals coincide. The cubic root of 99920017 is about 464.0351009539.

The spelling of 99920017 in words is "ninety-nine million, nine hundred twenty thousand, seventeen".

Divisors: 1 37 2700541 99920017