22771813 has 2 divisors, whose sum is σ = 22771814. Its totient is φ = 22771812.

The previous prime is 22771787. The next prime is 22771841. The reversal of 22771813 is 31817722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22724289 + 47524 = 4767^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 22771813 - 2¹⁷ = 22640741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22771013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11385906 + 11385907.

It is an arithmetic number, because the mean of its divisors is an integer number (11385907).

Almost surely, 2^22771813 is an apocalyptic number.

It is an amenable number.

22771813 is a deficient number, since it is larger than the sum of its proper divisors (1).

22771813 is an equidigital number, since it uses as much as digits as its factorization.

22771813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 22771813 is about 4771.9820829504. The cubic root of 22771813 is about 283.4430871989.

The spelling of 22771813 in words is "twenty-two million, seven hundred seventy-one thousand, eight hundred thirteen".