56517321 has 16 divisors (see below), whose sum is σ = 86448128. Its totient is φ = 32173200.

The previous prime is 56517319. The next prime is 56517323. The reversal of 56517321 is 12371565.

It is an interprime number because it is at equal distance from previous prime (56517319) and next prime (56517323).

It is not a de Polignac number, because 56517321 - 2¹ = 56517319 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 (56517323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 726 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (5403008).

Almost surely, 2^56517321 is an apocalyptic number.

It is an amenable number.

56517321 is a deficient number, since it is larger than the sum of its proper divisors (29930807).

56517321 is a wasteful number, since it uses less digits than its factorization.

56517321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10212.

The product of its digits is 6300, while the sum is 30.

The square root of 56517321 is about 7517.8002766767. The cubic root of 56517321 is about 383.7607219716.

Adding to 56517321 its reverse (12371565), we get a palindrome (68888886).

The spelling of 56517321 in words is "fifty-six million, five hundred seventeen thousand, three hundred twenty-one".