55558631 has 2 divisors, whose sum is σ = 55558632. Its totient is φ = 55558630.

The previous prime is 55558619. The next prime is 55558637. The reversal of 55558631 is 13685555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55558631 is a prime.

It is a super-2 number, since 2×55558631² = 6173522957188322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55558637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27779315 + 27779316.

It is an arithmetic number, because the mean of its divisors is an integer number (27779316).

Almost surely, 2^55558631 is an apocalyptic number.

55558631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55558631 is an equidigital number, since it uses as much as digits as its factorization.

55558631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90000, while the sum is 38.

The square root of 55558631 is about 7453.7662292294. The cubic root of 55558631 is about 381.5784550646.

The spelling of 55558631 in words is "fifty-five million, five hundred fifty-eight thousand, six hundred thirty-one".