22813561 has 4 divisors (see below), whose sum is σ = 22828900. Its totient is φ = 22798224.

The previous prime is 22813543. The next prime is 22813579. The reversal of 22813561 is 16531822.

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

It is an interprime number because it is at equal distance from previous prime (22813543) and next prime (22813579).

It can be written as a sum of positive squares in 2 ways, for example, as 14776336 + 8037225 = 3844^2 + 2835^2 .

It is a cyclic number.

It is not a de Polignac number, because 22813561 - 2¹³ = 22805369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22813501) 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, 5166 + ... + 8503.

It is an arithmetic number, because the mean of its divisors is an integer number (5707225).

Almost surely, 2^22813561 is an apocalyptic number.

It is an amenable number.

22813561 is a deficient number, since it is larger than the sum of its proper divisors (15339).

22813561 is a wasteful number, since it uses less digits than its factorization.

22813561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15338.

The product of its digits is 2880, while the sum is 28.

The square root of 22813561 is about 4776.3543629006. The cubic root of 22813561 is about 283.6161953308.

The spelling of 22813561 in words is "twenty-two million, eight hundred thirteen thousand, five hundred sixty-one".