99985131 has 16 divisors (see below), whose sum is σ = 148288000. Its totient is φ = 66583944.

The previous prime is 99985099. The next prime is 99985141. The reversal of 99985131 is 13158999.

It is not a de Polignac number, because 99985131 - 2⁵ = 99985099 is a prime.

It is a super-2 number, since 2×99985131² = 19994052842174322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99985141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36450 + ... + 39096.

It is an arithmetic number, because the mean of its divisors is an integer number (9268000).

Almost surely, 2^99985131 is an apocalyptic number.

99985131 is a deficient number, since it is larger than the sum of its proper divisors (48302869).

99985131 is a wasteful number, since it uses less digits than its factorization.

99985131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055 (or 4049 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 99985131 is about 9999.2565223621. The cubic root of 99985131 is about 464.1358769595.

It can be divided in two parts, 9998 and 5131, that added together give a square (15129 = 123²).

The spelling of 99985131 in words is "ninety-nine million, nine hundred eighty-five thousand, one hundred thirty-one".