97991172 has 36 divisors (see below), whose sum is σ = 248277120. Its totient is φ = 32587632.

The previous prime is 97991171. The next prime is 97991183. The reversal of 97991172 is 27119979.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (97991171) 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 11 ways as a sum of consecutive naturals, for example, 13729 + ... + 19607.

Almost surely, 2^97991172 is an apocalyptic number.

It is an amenable number.

97991172 is an abundant number, since it is smaller than the sum of its proper divisors (150285948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97991172 is a wasteful number, since it uses less digits than its factorization.

97991172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6352 (or 6347 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 97991172 is about 9899.0490452366. The cubic root of 97991172 is about 461.0297849359.

The spelling of 97991172 in words is "ninety-seven million, nine hundred ninety-one thousand, one hundred seventy-two".