111931139 has 2 divisors, whose sum is σ = 111931140. Its totient is φ = 111931138.

The previous prime is 111931093. The next prime is 111931153. The reversal of 111931139 is 931139111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111931139 is a prime.

It is equal to p_6407336 and since 111931139 and 6407336 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (111931159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55965569 + 55965570.

It is an arithmetic number, because the mean of its divisors is an integer number (55965570).

Almost surely, 2^111931139 is an apocalyptic number.

111931139 is a deficient number, since it is larger than the sum of its proper divisors (1).

111931139 is an equidigital number, since it uses as much as digits as its factorization.

111931139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729, while the sum is 29.

The square root of 111931139 is about 10579.7513675889. The cubic root of 111931139 is about 481.9296440068.

The spelling of 111931139 in words is "one hundred eleven million, nine hundred thirty-one thousand, one hundred thirty-nine".