22131509 has 2 divisors, whose sum is σ = 22131510. Its totient is φ = 22131508.

The previous prime is 22131493. The next prime is 22131521. The reversal of 22131509 is 90513122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17247409 + 4884100 = 4153^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 22131509 - 2⁴ = 22131493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22131709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065754 + 11065755.

It is an arithmetic number, because the mean of its divisors is an integer number (11065755).

Almost surely, 2^22131509 is an apocalyptic number.

It is an amenable number.

22131509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131509 is an equidigital number, since it uses as much as digits as its factorization.

22131509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 22131509 is about 4704.4137785701. The cubic root of 22131509 is about 280.7611475710.

The spelling of 22131509 in words is "twenty-two million, one hundred thirty-one thousand, five hundred nine".