22551 has 4 divisors (see below), whose sum is σ = 30072. Its totient is φ = 15032.

The previous prime is 22549. The next prime is 22567. The reversal of 22551 is 15522.

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

It is a cyclic number.

It is not a de Polignac number, because 22551 - 2¹ = 22549 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 22551.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 22551.

It is not an unprimeable number, because it can be changed into a prime (22501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756 + ... + 3761.

It is an arithmetic number, because the mean of its divisors is an integer number (7518).

2²²⁵⁵¹ is an apocalyptic number.

22551 is a deficient number, since it is larger than the sum of its proper divisors (7521).

22551 is an equidigital number, since it uses as much as digits as its factorization.

22551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7520.

The product of its digits is 100, while the sum is 15.

The square root of 22551 is about 150.1699037757. The cubic root of 22551 is about 28.2523949206.

It can be divided in two parts, 225 and 51, that added together give a triangular number (276 = T₂₃).

The spelling of 22551 in words is "twenty-two thousand, five hundred fifty-one".