22881561 has 4 divisors (see below), whose sum is σ = 30508752. Its totient is φ = 15254372.

The previous prime is 22881559. The next prime is 22881563. The reversal of 22881561 is 16518822.

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 an interprime number because it is at equal distance from previous prime (22881559) and next prime (22881563).

It is a cyclic number.

It is not a de Polignac number, because 22881561 - 2¹ = 22881559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22881563) 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, 3813591 + ... + 3813596.

It is an arithmetic number, because the mean of its divisors is an integer number (7627188).

Almost surely, 2^22881561 is an apocalyptic number.

It is an amenable number.

22881561 is a deficient number, since it is larger than the sum of its proper divisors (7627191).

22881561 is an equidigital number, since it uses as much as digits as its factorization.

22881561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627190.

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

The square root of 22881561 is about 4783.4674661797. The cubic root of 22881561 is about 283.8977058357.

The spelling of 22881561 in words is "twenty-two million, eight hundred eighty-one thousand, five hundred sixty-one".