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99985931 = 531886527
BaseRepresentation
bin1011111010110…
…10101000001011
320222010210220122
411331122220023
5201044022211
613531013455
72322603113
oct575325013
9228123818
1099985931
1151491a01
122959a28b
131793a296
14d3ca043
158ba06db
hex5f5aa0b

99985931 has 4 divisors (see below), whose sum is σ = 101872512. Its totient is φ = 98099352.

The previous prime is 99985927. The next prime is 99985973. The reversal of 99985931 is 13958999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13958999 = 23606913.

It is a cyclic number.

It is not a de Polignac number, because 99985931 - 22 = 99985927 is a prime.

It is a super-2 number, since 2×999859312 = 19994372795873522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1886527 = 99985931 / (9 + 9 + 9 + 8 + 5 + 9 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99915931) 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, 943211 + ... + 943316.

It is an arithmetic number, because the mean of its divisors is an integer number (25468128).

Almost surely, 299985931 is an apocalyptic number.

99985931 is a deficient number, since it is larger than the sum of its proper divisors (1886581).

99985931 is a wasteful number, since it uses less digits than its factorization.

99985931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886580.

The product of its digits is 787320, while the sum is 53.

The square root of 99985931 is about 9999.2965252562. The cubic root of 99985931 is about 464.1371148359.

The spelling of 99985931 in words is "ninety-nine million, nine hundred eighty-five thousand, nine hundred thirty-one".

Divisors: 1 53 1886527 99985931