56621513 has 4 divisors (see below), whose sum is σ = 60977028. Its totient is φ = 52266000.

The previous prime is 56621491. The next prime is 56621557. The reversal of 56621513 is 31512665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31512665 = 5 ⋅6302533.

It can be written as a sum of positive squares in 2 ways, for example, as 2569609 + 54051904 = 1603^2 + 7352^2 .

It is a cyclic number.

It is not a de Polignac number, because 56621513 - 2¹² = 56617417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56621573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2177738 + ... + 2177763.

It is an arithmetic number, because the mean of its divisors is an integer number (15244257).

Almost surely, 2^56621513 is an apocalyptic number.

It is an amenable number.

56621513 is a deficient number, since it is larger than the sum of its proper divisors (4355515).

56621513 is a wasteful number, since it uses less digits than its factorization.

56621513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355514.

The product of its digits is 5400, while the sum is 29.

The square root of 56621513 is about 7524.7267724483. The cubic root of 56621513 is about 383.9964034132.

The spelling of 56621513 in words is "fifty-six million, six hundred twenty-one thousand, five hundred thirteen".