56515553 has 2 divisors, whose sum is σ = 56515554. Its totient is φ = 56515552.

The previous prime is 56515549. The next prime is 56515579. The reversal of 56515553 is 35551565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 5650129 = 7132^2 + 2377^2 .

It is a cyclic number.

It is not a de Polignac number, because 56515553 - 2² = 56515549 is a prime.

It is a super-3 number, since 3×56515553³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (56515513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28257776 + 28257777.

It is an arithmetic number, because the mean of its divisors is an integer number (28257777).

Almost surely, 2^56515553 is an apocalyptic number.

It is an amenable number.

56515553 is a deficient number, since it is larger than the sum of its proper divisors (1).

56515553 is an equidigital number, since it uses as much as digits as its factorization.

56515553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56250, while the sum is 35.

The square root of 56515553 is about 7517.6826881693. The cubic root of 56515553 is about 383.7567202719.

The spelling of 56515553 in words is "fifty-six million, five hundred fifteen thousand, five hundred fifty-three".