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99997861 = 591694879
BaseRepresentation
bin1011111010111…
…01100010100101
320222011102021111
411331131202211
5201044412421
613531145021
72322652645
oct575354245
9228142244
1099997861
115149a967
12295a5171
1317942842
14d3d0525
158ba3ee1
hex5f5d8a5

99997861 has 4 divisors (see below), whose sum is σ = 101692800. Its totient is φ = 98302924.

The previous prime is 99997841. The next prime is 99997867. The reversal of 99997861 is 16879999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99997861 - 211 = 99995813 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99997796 and 99997805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847381 + ... + 847498.

It is an arithmetic number, because the mean of its divisors is an integer number (25423200).

Almost surely, 299997861 is an apocalyptic number.

It is an amenable number.

99997861 is a deficient number, since it is larger than the sum of its proper divisors (1694939).

99997861 is a wasteful number, since it uses less digits than its factorization.

99997861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694938.

The product of its digits is 2204496, while the sum is 58.

The square root of 99997861 is about 9999.8930494281. The cubic root of 99997861 is about 464.1555738848.

The spelling of 99997861 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred sixty-one".

Divisors: 1 59 1694879 99997861