55113931 has 2 divisors, whose sum is σ = 55113932. Its totient is φ = 55113930.

The previous prime is 55113913. The next prime is 55113959. The reversal of 55113931 is 13931155.

Together with previous prime (55113913) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (55113959) can be obtained adding 55113931 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55113931 - 2⁵ = 55113899 is a prime.

It is a super-2 number, since 2×55113931² = 6075090780545522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55113931.

It is not a weakly prime, because it can be changed into another prime (55113901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27556965 + 27556966.

It is an arithmetic number, because the mean of its divisors is an integer number (27556966).

Almost surely, 2^55113931 is an apocalyptic number.

55113931 is a deficient number, since it is larger than the sum of its proper divisors (1).

55113931 is an equidigital number, since it uses as much as digits as its factorization.

55113931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2025, while the sum is 28.

The square root of 55113931 is about 7423.8757398006. The cubic root of 55113931 is about 380.5576553784.

The spelling of 55113931 in words is "fifty-five million, one hundred thirteen thousand, nine hundred thirty-one".