56615321 has 8 divisors (see below), whose sum is σ = 68509440. Its totient is φ = 45672768.

The previous prime is 56615297. The next prime is 56615323. The reversal of 56615321 is 12351665.

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

It is a cyclic number.

It is not a de Polignac number, because 56615321 - 2⁶ = 56615257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56615323) 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, 237761 + ... + 237998.

It is an arithmetic number, because the mean of its divisors is an integer number (8563680).

Almost surely, 2^56615321 is an apocalyptic number.

It is an amenable number.

56615321 is a deficient number, since it is larger than the sum of its proper divisors (11894119).

56615321 is a wasteful number, since it uses less digits than its factorization.

56615321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475783.

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

The square root of 56615321 is about 7524.3153176884. The cubic root of 56615321 is about 383.9824052449.

Adding to 56615321 its reverse (12351665), we get a palindrome (68966986).

The spelling of 56615321 in words is "fifty-six million, six hundred fifteen thousand, three hundred twenty-one".