99158681 has 4 divisors (see below), whose sum is σ = 103469952. Its totient is φ = 94847412.

The previous prime is 99158651. The next prime is 99158699. The reversal of 99158681 is 18685199.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18685199 = 13 ⋅1437323.

It is a cyclic number.

It is not a de Polignac number, because 99158681 - 2¹⁸ = 98896537 is a prime.

It is a super-2 number, since 2×99158681² = 19664888035319522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99158641) 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, 2155601 + ... + 2155646.

It is an arithmetic number, because the mean of its divisors is an integer number (25867488).

Almost surely, 2^99158681 is an apocalyptic number.

It is an amenable number.

99158681 is a deficient number, since it is larger than the sum of its proper divisors (4311271).

99158681 is a wasteful number, since it uses less digits than its factorization.

99158681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311270.

The product of its digits is 155520, while the sum is 47.

The square root of 99158681 is about 9957.8451986361. The cubic root of 99158681 is about 462.8535301347.

The spelling of 99158681 in words is "ninety-nine million, one hundred fifty-eight thousand, six hundred eighty-one".