111640591 has 2 divisors, whose sum is σ = 111640592. Its totient is φ = 111640590.

The previous prime is 111640589. The next prime is 111640609. The reversal of 111640591 is 195046111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111640591 - 2¹ = 111640589 is a prime.

Together with 111640589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111640541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55820295 + 55820296.

It is an arithmetic number, because the mean of its divisors is an integer number (55820296).

Almost surely, 2^111640591 is an apocalyptic number.

111640591 is a deficient number, since it is larger than the sum of its proper divisors (1).

111640591 is an equidigital number, since it uses as much as digits as its factorization.

111640591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 111640591 is about 10566.0111205696. The cubic root of 111640591 is about 481.5122891130.

The spelling of 111640591 in words is "one hundred eleven million, six hundred forty thousand, five hundred ninety-one".