22291561 has 4 divisors (see below), whose sum is σ = 22380624. Its totient is φ = 22202500.

The previous prime is 22291553. The next prime is 22291589. The reversal of 22291561 is 16519222.

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 22291561 - 2³ = 22291553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22291261) 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, 44155 + ... + 44656.

It is an arithmetic number, because the mean of its divisors is an integer number (5595156).

Almost surely, 2^22291561 is an apocalyptic number.

It is an amenable number.

22291561 is a deficient number, since it is larger than the sum of its proper divisors (89063).

22291561 is an equidigital number, since it uses as much as digits as its factorization.

22291561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89062.

The product of its digits is 2160, while the sum is 28.

The square root of 22291561 is about 4721.3939678870. The cubic root of 22291561 is about 281.4363311108.

The spelling of 22291561 in words is "twenty-two million, two hundred ninety-one thousand, five hundred sixty-one".