22451309 has 2 divisors, whose sum is σ = 22451310. Its totient is φ = 22451308.

The previous prime is 22451291. The next prime is 22451311. The reversal of 22451309 is 90315422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 2111209 = 4510^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 22451309 - 2⁸ = 22451053 is a prime.

It is a super-2 number, since 2×22451309² = 1008122551626962, which contains 22 as substring.

Together with 22451311, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1415753 and since 22451309 and 1415753 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22451609) 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, 11225654 + 11225655.

It is an arithmetic number, because the mean of its divisors is an integer number (11225655).

Almost surely, 2^22451309 is an apocalyptic number.

It is an amenable number.

22451309 is a deficient number, since it is larger than the sum of its proper divisors (1).

22451309 is an equidigital number, since it uses as much as digits as its factorization.

22451309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 22451309 is about 4738.2812284625. The cubic root of 22451309 is about 282.1070172099.

The spelling of 22451309 in words is "twenty-two million, four hundred fifty-one thousand, three hundred nine".