22491613 has 2 divisors, whose sum is σ = 22491614. Its totient is φ = 22491612.

The previous prime is 22491563. The next prime is 22491643. The reversal of 22491613 is 31619422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 8749764 = 3707^2 + 2958^2 .

It is a cyclic number.

It is not a de Polignac number, because 22491613 - 2¹³ = 22483421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22491643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11245806 + 11245807.

It is an arithmetic number, because the mean of its divisors is an integer number (11245807).

Almost surely, 2^22491613 is an apocalyptic number.

It is an amenable number.

22491613 is a deficient number, since it is larger than the sum of its proper divisors (1).

22491613 is an equidigital number, since it uses as much as digits as its factorization.

22491613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 22491613 is about 4742.5323404274. The cubic root of 22491613 is about 282.2757266642.

It can be divided in two parts, 22491 and 613, that added together give a square (23104 = 152²).

The spelling of 22491613 in words is "twenty-two million, four hundred ninety-one thousand, six hundred thirteen".