99117081 has 16 divisors (see below), whose sum is σ = 167817600. Its totient is φ = 56638224.

The previous prime is 99117077. The next prime is 99117121. The reversal of 99117081 is 18071199.

It is not a de Polignac number, because 99117081 - 2² = 99117077 is a prime.

It is a super-2 number, since 2×99117081² = 19648391491921122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (99117181) 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, 262026 + ... + 262403.

It is an arithmetic number, because the mean of its divisors is an integer number (10488600).

Almost surely, 2^99117081 is an apocalyptic number.

It is an amenable number.

99117081 is a deficient number, since it is larger than the sum of its proper divisors (68700519).

99117081 is a wasteful number, since it uses less digits than its factorization.

99117081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524445 (or 524439 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 99117081 is about 9955.7561741939. The cubic root of 99117081 is about 462.7887941650.

The spelling of 99117081 in words is "ninety-nine million, one hundred seventeen thousand, eighty-one".