56321561 has 8 divisors (see below), whose sum is σ = 59784480. Its totient is φ = 52875328.

The previous prime is 56321537. The next prime is 56321569. The reversal of 56321561 is 16512365.

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 56321561 - 2⁶ = 56321497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56321569) 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, 3170 + ... + 11076.

It is an arithmetic number, because the mean of its divisors is an integer number (7473060).

Almost surely, 2^56321561 is an apocalyptic number.

It is an amenable number.

56321561 is a deficient number, since it is larger than the sum of its proper divisors (3462919).

56321561 is a wasteful number, since it uses less digits than its factorization.

56321561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8343.

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

The square root of 56321561 is about 7504.7692169713. The cubic root of 56321561 is about 383.3171299179.

The spelling of 56321561 in words is "fifty-six million, three hundred twenty-one thousand, five hundred sixty-one".