55111631 has 2 divisors, whose sum is σ = 55111632. Its totient is φ = 55111630.

The previous prime is 55111627. The next prime is 55111649. The reversal of 55111631 is 13611155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55111631 - 2² = 55111627 is a prime.

It is a super-2 number, since 2×55111631² = 6074583742960322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55111597 and 55111606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55111601) 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, 27555815 + 27555816.

It is an arithmetic number, because the mean of its divisors is an integer number (27555816).

Almost surely, 2^55111631 is an apocalyptic number.

55111631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55111631 is an equidigital number, since it uses as much as digits as its factorization.

55111631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 23.

The square root of 55111631 is about 7423.7208325745. The cubic root of 55111631 is about 380.5523615276.

Adding to 55111631 its reverse (13611155), we get a palindrome (68722786).

The spelling of 55111631 in words is "fifty-five million, one hundred eleven thousand, six hundred thirty-one".