111931897 has 12 divisors (see below), whose sum is σ = 140609728. Its totient is φ = 87219000.

The previous prime is 111931879. The next prime is 111931901. The reversal of 111931897 is 798139111.

It is not a de Polignac number, because 111931897 - 2¹⁹ = 111407609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111931847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65229 + ... + 66922.

Almost surely, 2^111931897 is an apocalyptic number.

It is an amenable number.

111931897 is a deficient number, since it is larger than the sum of its proper divisors (28677831).

111931897 is a wasteful number, since it uses less digits than its factorization.

111931897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132180 (or 132169 counting only the distinct ones).

The product of its digits is 13608, while the sum is 40.

The square root of 111931897 is about 10579.7871906764. The cubic root of 111931897 is about 481.9307318835.

The spelling of 111931897 in words is "one hundred eleven million, nine hundred thirty-one thousand, eight hundred ninety-seven".