55711631 has 2 divisors, whose sum is σ = 55711632. Its totient is φ = 55711630.

The previous prime is 55711609. The next prime is 55711633. The reversal of 55711631 is 13611755.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55711631 is a prime.

It is a super-2 number, since 2×55711631² = 6207571657360322, which contains 22 as substring.

Together with 55711633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55711594 and 55711603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55711633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27855815 + 27855816.

It is an arithmetic number, because the mean of its divisors is an integer number (27855816).

Almost surely, 2^55711631 is an apocalyptic number.

55711631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55711631 is an equidigital number, since it uses as much as digits as its factorization.

55711631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 29.

The square root of 55711631 is about 7464.0224410166. The cubic root of 55711631 is about 381.9284036575.

The spelling of 55711631 in words is "fifty-five million, seven hundred eleven thousand, six hundred thirty-one".