55717631 has 2 divisors, whose sum is σ = 55717632. Its totient is φ = 55717630.

The previous prime is 55717603. The next prime is 55717657. The reversal of 55717631 is 13671755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55717631 - 2¹⁸ = 55455487 is a prime.

It is a super-2 number, since 2×55717631² = 6208908808504322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 55717591 and 55717600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55717331) 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, 27858815 + 27858816.

It is an arithmetic number, because the mean of its divisors is an integer number (27858816).

Almost surely, 2^55717631 is an apocalyptic number.

55717631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55717631 is an equidigital number, since it uses as much as digits as its factorization.

55717631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 35.

The square root of 55717631 is about 7464.4243582476. The cubic root of 55717631 is about 381.9421140690.

The spelling of 55717631 in words is "fifty-five million, seven hundred seventeen thousand, six hundred thirty-one".