56906621 has 4 divisors (see below), whose sum is σ = 57871200. Its totient is φ = 55942044.

The previous prime is 56906593. The next prime is 56906659. The reversal of 56906621 is 12660965.

It is a happy number.

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 56906621 - 2⁶ = 56906557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56906221) 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, 482201 + ... + 482318.

It is an arithmetic number, because the mean of its divisors is an integer number (14467800).

Almost surely, 2^56906621 is an apocalyptic number.

It is an amenable number.

56906621 is a deficient number, since it is larger than the sum of its proper divisors (964579).

56906621 is an equidigital number, since it uses as much as digits as its factorization.

56906621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964578.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 56906621 is about 7543.6477250731. The cubic root of 56906621 is about 384.6398408418.

The spelling of 56906621 in words is "fifty-six million, nine hundred six thousand, six hundred twenty-one".