56617021 has 8 divisors (see below), whose sum is σ = 60407424. Its totient is φ = 52877760.

The previous prime is 56617013. The next prime is 56617027. The reversal of 56617021 is 12071665.

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 56617021 - 2³ = 56617013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56617027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10485 + ... + 14938.

It is an arithmetic number, because the mean of its divisors is an integer number (7550928).

Almost surely, 2^56617021 is an apocalyptic number.

It is an amenable number.

56617021 is a deficient number, since it is larger than the sum of its proper divisors (3790403).

56617021 is a wasteful number, since it uses less digits than its factorization.

56617021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25571.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 56617021 is about 7524.4282839296. The cubic root of 56617021 is about 383.9862485129.

Adding to 56617021 its reverse (12071665), we get a palindrome (68688686).

The spelling of 56617021 in words is "fifty-six million, six hundred seventeen thousand, twenty-one".