22815857 has 2 divisors, whose sum is σ = 22815858. Its totient is φ = 22815856.

The previous prime is 22815841. The next prime is 22815869. The reversal of 22815857 is 75851822.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21752896 + 1062961 = 4664^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 22815857 - 2⁴ = 22815841 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22815857.

It is not a weakly prime, because it can be changed into another prime (22815817) 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, 11407928 + 11407929.

It is an arithmetic number, because the mean of its divisors is an integer number (11407929).

Almost surely, 2^22815857 is an apocalyptic number.

It is an amenable number.

22815857 is a deficient number, since it is larger than the sum of its proper divisors (1).

22815857 is an equidigital number, since it uses as much as digits as its factorization.

22815857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 38.

The square root of 22815857 is about 4776.5947075296. The cubic root of 22815857 is about 283.6257095687.

The spelling of 22815857 in words is "twenty-two million, eight hundred fifteen thousand, eight hundred fifty-seven".