55313531 has 12 divisors (see below), whose sum is σ = 68453712. Its totient is φ = 43763616.

The previous prime is 55313513. The next prime is 55313537. The reversal of 55313531 is 13531355.

It is not a de Polignac number, because 55313531 - 2¹⁰ = 55312507 is a prime.

It is a super-2 number, since 2×55313531² = 6119173423375922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55313531.

It is not an unprimeable number, because it can be changed into a prime (55313537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22196 + ... + 24561.

It is an arithmetic number, because the mean of its divisors is an integer number (5704476).

Almost surely, 2^55313531 is an apocalyptic number.

55313531 is a deficient number, since it is larger than the sum of its proper divisors (13140181).

55313531 is a wasteful number, since it uses less digits than its factorization.

55313531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46790 (or 46777 counting only the distinct ones).

The product of its digits is 3375, while the sum is 26.

The square root of 55313531 is about 7437.3067033705. The cubic root of 55313531 is about 381.0165096880.

Adding to 55313531 its reverse (13531355), we get a palindrome (68844886).

The spelling of 55313531 in words is "fifty-five million, three hundred thirteen thousand, five hundred thirty-one".