97891155 has 24 divisors (see below), whose sum is σ = 169986960. Its totient is φ = 52113600.

The previous prime is 97891147. The next prime is 97891193. The reversal of 97891155 is 55119879.

It is not a de Polignac number, because 97891155 - 2³ = 97891147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 97891155.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28005 + ... + 31305.

It is an arithmetic number, because the mean of its divisors is an integer number (7082790).

Almost surely, 2^97891155 is an apocalyptic number.

97891155 is a deficient number, since it is larger than the sum of its proper divisors (72095805).

97891155 is a wasteful number, since it uses less digits than its factorization.

97891155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971 (or 3968 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 97891155 is about 9893.9959066092. The cubic root of 97891155 is about 460.8728779003.

The spelling of 97891155 in words is "ninety-seven million, eight hundred ninety-one thousand, one hundred fifty-five".