55507513 has 2 divisors, whose sum is σ = 55507514. Its totient is φ = 55507512.

The previous prime is 55507489. The next prime is 55507523. The reversal of 55507513 is 31570555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38093584 + 17413929 = 6172^2 + 4173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55507513 is a prime.

It is not a weakly prime, because it can be changed into another prime (55507523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27753756 + 27753757.

It is an arithmetic number, because the mean of its divisors is an integer number (27753757).

Almost surely, 2^55507513 is an apocalyptic number.

It is an amenable number.

55507513 is a deficient number, since it is larger than the sum of its proper divisors (1).

55507513 is an equidigital number, since it uses as much as digits as its factorization.

55507513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13125, while the sum is 31.

The square root of 55507513 is about 7450.3364353565. The cubic root of 55507513 is about 381.4613924688.

The spelling of 55507513 in words is "fifty-five million, five hundred seven thousand, five hundred thirteen".