56615331 has 8 divisors (see below), whose sum is σ = 77922304. Its totient is φ = 36525960.

The previous prime is 56615327. The next prime is 56615333. The reversal of 56615331 is 13351665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56615331 - 2² = 56615327 is a prime.

It is a super-2 number, since 2×56615331² = 6410591408479122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56615333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304291 + ... + 304476.

It is an arithmetic number, because the mean of its divisors is an integer number (9740288).

Almost surely, 2^56615331 is an apocalyptic number.

56615331 is a deficient number, since it is larger than the sum of its proper divisors (21306973).

56615331 is a wasteful number, since it uses less digits than its factorization.

56615331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608801.

The product of its digits is 8100, while the sum is 30.

The square root of 56615331 is about 7524.3159822006. The cubic root of 56615331 is about 383.9824278526.

Adding to 56615331 its reverse (13351665), we get a palindrome (69966996).

The spelling of 56615331 in words is "fifty-six million, six hundred fifteen thousand, three hundred thirty-one".