55313231 has 2 divisors, whose sum is σ = 55313232. Its totient is φ = 55313230.

The previous prime is 55313227. The next prime is 55313281. The reversal of 55313231 is 13231355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55313231 - 2² = 55313227 is a prime.

It is a super-2 number, since 2×55313231² = 6119107047318722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55313197 and 55313206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55313281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27656615 + 27656616.

It is an arithmetic number, because the mean of its divisors is an integer number (27656616).

Almost surely, 2^55313231 is an apocalyptic number.

55313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55313231 is an equidigital number, since it uses as much as digits as its factorization.

55313231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 23.

The square root of 55313231 is about 7437.2865347518. The cubic root of 55313231 is about 381.0158208562.

Adding to 55313231 its reverse (13231355), we get a palindrome (68544586).

The spelling of 55313231 in words is "fifty-five million, three hundred thirteen thousand, two hundred thirty-one".