99164981 has 4 divisors (see below), whose sum is σ = 99302112. Its totient is φ = 99027852.

The previous prime is 99164977. The next prime is 99165037. The reversal of 99164981 is 18946199.

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: 18946199 = 4003 ⋅4733.

It is a cyclic number.

It is not a de Polignac number, because 99164981 - 2² = 99164977 is a prime.

It is a super-2 number, since 2×99164981² = 19667386913460722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99164581) 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, 67475 + ... + 68928.

It is an arithmetic number, because the mean of its divisors is an integer number (24825528).

Almost surely, 2^99164981 is an apocalyptic number.

It is an amenable number.

99164981 is a deficient number, since it is larger than the sum of its proper divisors (137131).

99164981 is a wasteful number, since it uses less digits than its factorization.

99164981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137130.

The product of its digits is 139968, while the sum is 47.

The square root of 99164981 is about 9958.1615271093. The cubic root of 99164981 is about 462.8633323206.

The spelling of 99164981 in words is "ninety-nine million, one hundred sixty-four thousand, nine hundred eighty-one".