22455561 has 4 divisors (see below), whose sum is σ = 29940752. Its totient is φ = 14970372.

The previous prime is 22455557. The next prime is 22455581. The reversal of 22455561 is 16555422.

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 not a de Polignac number, because 22455561 - 2² = 22455557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22455551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3742591 + ... + 3742596.

It is an arithmetic number, because the mean of its divisors is an integer number (7485188).

Almost surely, 2^22455561 is an apocalyptic number.

It is an amenable number.

22455561 is a deficient number, since it is larger than the sum of its proper divisors (7485191).

22455561 is an equidigital number, since it uses as much as digits as its factorization.

22455561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7485190.

The product of its digits is 12000, while the sum is 30.

The square root of 22455561 is about 4738.7298931254. The cubic root of 22455561 is about 282.1248252780.

The spelling of 22455561 in words is "twenty-two million, four hundred fifty-five thousand, five hundred sixty-one".