56613021 has 4 divisors (see below), whose sum is σ = 75484032. Its totient is φ = 37742012.

The previous prime is 56613019. The next prime is 56613031. The reversal of 56613021 is 12031665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56613021 - 2¹ = 56613019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56612982 and 56613000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56613031) 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 3 ways as a sum of consecutive naturals, for example, 9435501 + ... + 9435506.

It is an arithmetic number, because the mean of its divisors is an integer number (18871008).

Almost surely, 2^56613021 is an apocalyptic number.

It is an amenable number.

56613021 is a deficient number, since it is larger than the sum of its proper divisors (18871011).

56613021 is a wasteful number, since it uses less digits than its factorization.

56613021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18871010.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 56613021 is about 7524.1624783095. The cubic root of 56613021 is about 383.9772054069.

Adding to 56613021 its reverse (12031665), we get a palindrome (68644686).

The spelling of 56613021 in words is "fifty-six million, six hundred thirteen thousand, twenty-one".