56321551 has 8 divisors (see below), whose sum is σ = 66168144. Its totient is φ = 47262720.

The previous prime is 56321537. The next prime is 56321569. The reversal of 56321551 is 15512365.

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 56321551 - 2⁵ = 56321519 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 (56321501) 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, 196786 + ... + 197071.

It is an arithmetic number, because the mean of its divisors is an integer number (8271018).

Almost surely, 2^56321551 is an apocalyptic number.

56321551 is a deficient number, since it is larger than the sum of its proper divisors (9846593).

56321551 is a wasteful number, since it uses less digits than its factorization.

56321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393881.

The product of its digits is 4500, while the sum is 28.

The square root of 56321551 is about 7504.7685507283. The cubic root of 56321551 is about 383.3171072317.

The spelling of 56321551 in words is "fifty-six million, three hundred twenty-one thousand, five hundred fifty-one".