22981957 has 2 divisors, whose sum is σ = 22981958. Its totient is φ = 22981956.

The previous prime is 22981939. The next prime is 22981997. The reversal of 22981957 is 75918922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 4198401 = 4334^2 + 2049^2 .

It is a cyclic number.

It is not a de Polignac number, because 22981957 - 2¹¹ = 22979909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22981927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11490978 + 11490979.

It is an arithmetic number, because the mean of its divisors is an integer number (11490979).

Almost surely, 2^22981957 is an apocalyptic number.

It is an amenable number.

22981957 is a deficient number, since it is larger than the sum of its proper divisors (1).

22981957 is an equidigital number, since it uses as much as digits as its factorization.

22981957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 22981957 is about 4793.9500414585. The cubic root of 22981957 is about 284.3123134700.

The spelling of 22981957 in words is "twenty-two million, nine hundred eighty-one thousand, nine hundred fifty-seven".