55631287 has 2 divisors, whose sum is σ = 55631288. Its totient is φ = 55631286.

The previous prime is 55631263. The next prime is 55631299. The reversal of 55631287 is 78213655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55631287 - 2¹⁵ = 55598519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55631237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27815643 + 27815644.

It is an arithmetic number, because the mean of its divisors is an integer number (27815644).

Almost surely, 2^55631287 is an apocalyptic number.

55631287 is a deficient number, since it is larger than the sum of its proper divisors (1).

55631287 is an equidigital number, since it uses as much as digits as its factorization.

55631287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 55631287 is about 7458.6384146170. The cubic root of 55631287 is about 381.7447171875.

The spelling of 55631287 in words is "fifty-five million, six hundred thirty-one thousand, two hundred eighty-seven".