22981657 has 2 divisors, whose sum is σ = 22981658. Its totient is φ = 22981656.

The previous prime is 22981643. The next prime is 22981663. The reversal of 22981657 is 75618922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 4910656 = 4251^2 + 2216^2 .

It is a cyclic number.

It is not a de Polignac number, because 22981657 - 2²³ = 14593049 is a prime.

It is not a weakly prime, because it can be changed into another prime (22981667) 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, 11490828 + 11490829.

It is an arithmetic number, because the mean of its divisors is an integer number (11490829).

Almost surely, 2^22981657 is an apocalyptic number.

It is an amenable number.

22981657 is a deficient number, since it is larger than the sum of its proper divisors (1).

22981657 is an equidigital number, since it uses as much as digits as its factorization.

22981657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 22981657 is about 4793.9187519189. The cubic root of 22981657 is about 284.3110763536.

The spelling of 22981657 in words is "twenty-two million, nine hundred eighty-one thousand, six hundred fifty-seven".