55315631 has 16 divisors (see below), whose sum is σ = 66850560. Its totient is φ = 44712000.

The previous prime is 55315619. The next prime is 55315643. The reversal of 55315631 is 13651355.

55315631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55315619) and next prime (55315643).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55315631 is a prime.

It is a super-2 number, since 2×55315631² = 6119638065856322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55315594 and 55315603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55315651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32555 + ... + 34211.

It is an arithmetic number, because the mean of its divisors is an integer number (4178160).

Almost surely, 2^55315631 is an apocalyptic number.

55315631 is a deficient number, since it is larger than the sum of its proper divisors (11534929).

55315631 is a wasteful number, since it uses less digits than its factorization.

55315631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934.

The product of its digits is 6750, while the sum is 29.

The square root of 55315631 is about 7437.4478821703. The cubic root of 55315631 is about 381.0213314409.

Adding to 55315631 its reverse (13651355), we get a palindrome (68966986).

The spelling of 55315631 in words is "fifty-five million, three hundred fifteen thousand, six hundred thirty-one".