22815861 has 4 divisors (see below), whose sum is σ = 30421152. Its totient is φ = 15210572.

The previous prime is 22815857. The next prime is 22815869. The reversal of 22815861 is 16851822.

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 22815861 - 2² = 22815857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22815869) 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, 3802641 + ... + 3802646.

It is an arithmetic number, because the mean of its divisors is an integer number (7605288).

Almost surely, 2^22815861 is an apocalyptic number.

It is an amenable number.

22815861 is a deficient number, since it is larger than the sum of its proper divisors (7605291).

22815861 is an equidigital number, since it uses as much as digits as its factorization.

22815861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605290.

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

The square root of 22815861 is about 4776.5951262379. The cubic root of 22815861 is about 283.6257261435.

The spelling of 22815861 in words is "twenty-two million, eight hundred fifteen thousand, eight hundred sixty-one".