22509881 has 2 divisors, whose sum is σ = 22509882. Its totient is φ = 22509880.

The previous prime is 22509871. The next prime is 22509919. The reversal of 22509881 is 18890522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21939856 + 570025 = 4684^2 + 755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22509881 is a prime.

It is a super-2 number, since 2×22509881² = 1013389485268322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22509871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11254940 + 11254941.

It is an arithmetic number, because the mean of its divisors is an integer number (11254941).

Almost surely, 2^22509881 is an apocalyptic number.

It is an amenable number.

22509881 is a deficient number, since it is larger than the sum of its proper divisors (1).

22509881 is an equidigital number, since it uses as much as digits as its factorization.

22509881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 22509881 is about 4744.4579247792. The cubic root of 22509881 is about 282.3521287363.

The spelling of 22509881 in words is "twenty-two million, five hundred nine thousand, eight hundred eighty-one".