55315613 has 2 divisors, whose sum is σ = 55315614. Its totient is φ = 55315612.

The previous prime is 55315609. The next prime is 55315619. The reversal of 55315613 is 31651355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49942489 + 5373124 = 7067^2 + 2318^2 .

It is a cyclic number.

It is not a de Polignac number, because 55315613 - 2² = 55315609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55315619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27657806 + 27657807.

It is an arithmetic number, because the mean of its divisors is an integer number (27657807).

Almost surely, 2^55315613 is an apocalyptic number.

It is an amenable number.

55315613 is a deficient number, since it is larger than the sum of its proper divisors (1).

55315613 is an equidigital number, since it uses as much as digits as its factorization.

55315613 is an evil number, because the sum of its binary digits is even.

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

The square root of 55315613 is about 7437.4466720777. The cubic root of 55315613 is about 381.0212901121.

Adding to 55315613 its reverse (31651355), we get a palindrome (86966968).

The spelling of 55315613 in words is "fifty-five million, three hundred fifteen thousand, six hundred thirteen".