56501321 has 4 divisors (see below), whose sum is σ = 57879444. Its totient is φ = 55123200.

The previous prime is 56501299. The next prime is 56501323. The reversal of 56501321 is 12310565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6996025 + 49505296 = 2645^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 56501321 - 2¹⁴ = 56484937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56501323) 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, 689000 + ... + 689081.

It is an arithmetic number, because the mean of its divisors is an integer number (14469861).

Almost surely, 2^56501321 is an apocalyptic number.

It is an amenable number.

56501321 is a deficient number, since it is larger than the sum of its proper divisors (1378123).

56501321 is a wasteful number, since it uses less digits than its factorization.

56501321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378122.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 56501321 is about 7516.7360602857. The cubic root of 56501321 is about 383.7245044548.

Adding to 56501321 its reverse (12310565), we get a palindrome (68811886).

The spelling of 56501321 in words is "fifty-six million, five hundred one thousand, three hundred twenty-one".