22815913 has 2 divisors, whose sum is σ = 22815914. Its totient is φ = 22815912.

The previous prime is 22815901. The next prime is 22815959. The reversal of 22815913 is 31951822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 3736489 = 4368^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 22815913 - 2¹³ = 22807721 is a prime.

It is not a weakly prime, because it can be changed into another prime (22815973) 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 as a sum of consecutive naturals, namely, 11407956 + 11407957.

It is an arithmetic number, because the mean of its divisors is an integer number (11407957).

Almost surely, 2^22815913 is an apocalyptic number.

It is an amenable number.

22815913 is a deficient number, since it is larger than the sum of its proper divisors (1).

22815913 is an equidigital number, since it uses as much as digits as its factorization.

22815913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 22815913 is about 4776.6005694427. The cubic root of 22815913 is about 283.6259416153.

The spelling of 22815913 in words is "twenty-two million, eight hundred fifteen thousand, nine hundred thirteen".