111557591 has 2 divisors, whose sum is σ = 111557592. Its totient is φ = 111557590.

The previous prime is 111557581. The next prime is 111557603. The reversal of 111557591 is 195755111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111557591 is a prime.

It is a super-2 number, since 2×111557591² = 24890192219446562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111557581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55778795 + 55778796.

It is an arithmetic number, because the mean of its divisors is an integer number (55778796).

Almost surely, 2^111557591 is an apocalyptic number.

111557591 is a deficient number, since it is larger than the sum of its proper divisors (1).

111557591 is an equidigital number, since it uses as much as digits as its factorization.

111557591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 35.

The square root of 111557591 is about 10562.0827018160. The cubic root of 111557591 is about 481.3929316047.

The spelling of 111557591 in words is "one hundred eleven million, five hundred fifty-seven thousand, five hundred ninety-one".