99791181 has 48 divisors (see below), whose sum is σ = 174869760. Its totient is φ = 53602560.

The previous prime is 99791129. The next prime is 99791191. The reversal of 99791181 is 18119799.

It is not a de Polignac number, because 99791181 - 2⁷ = 99791053 is a prime.

It is a super-2 number, since 2×99791181² = 19916559610749522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99791191) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87825 + ... + 88953.

It is an arithmetic number, because the mean of its divisors is an integer number (3643120).

Almost surely, 2^99791181 is an apocalyptic number.

It is an amenable number.

99791181 is a deficient number, since it is larger than the sum of its proper divisors (75078579).

99791181 is a wasteful number, since it uses less digits than its factorization.

99791181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226 (or 1223 counting only the distinct ones).

The product of its digits is 40824, while the sum is 45.

The square root of 99791181 is about 9989.5535936297. The cubic root of 99791181 is about 463.8355742336.

The spelling of 99791181 in words is "ninety-nine million, seven hundred ninety-one thousand, one hundred eighty-one".