56551 has 8 divisors (see below), whose sum is σ = 63504. Its totient is φ = 49920.

The previous prime is 56543. The next prime is 56569. The reversal of 56551 is 15565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 8-Lehmer number, since φ(56551) divides (56551-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 56551 - 2³ = 56543 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 (56501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (7938).

2⁵⁶⁵⁵¹ is an apocalyptic number.

56551 is a deficient number, since it is larger than the sum of its proper divisors (6953).

56551 is a wasteful number, since it uses less digits than its factorization.

56551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 750, while the sum is 22.

The square root of 56551 is about 237.8045415883. The cubic root of 56551 is about 38.3836935250.

It can be divided in two parts, 565 and 51, that added together give a palindrome (616).

The spelling of 56551 in words is "fifty-six thousand, five hundred fifty-one".