22518861 has 4 divisors (see below), whose sum is σ = 30025152. Its totient is φ = 15012572.

The previous prime is 22518851. The next prime is 22518889. The reversal of 22518861 is 16881522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22518861 - 2¹⁰ = 22517837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22518851) 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, 3753141 + ... + 3753146.

It is an arithmetic number, because the mean of its divisors is an integer number (7506288).

Almost surely, 2^22518861 is an apocalyptic number.

It is an amenable number.

22518861 is a deficient number, since it is larger than the sum of its proper divisors (7506291).

22518861 is an equidigital number, since it uses as much as digits as its factorization.

22518861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506290.

The product of its digits is 7680, while the sum is 33.

The square root of 22518861 is about 4745.4041977475. The cubic root of 22518861 is about 282.3896705462.

The spelling of 22518861 in words is "twenty-two million, five hundred eighteen thousand, eight hundred sixty-one".