22157797 has 2 divisors, whose sum is σ = 22157798. Its totient is φ = 22157796.

The previous prime is 22157789. The next prime is 22157867. The reversal of 22157797 is 79775122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11621281 + 10536516 = 3409^2 + 3246^2 .

It is a cyclic number.

It is not a de Polignac number, because 22157797 - 2³ = 22157789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22157767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078898 + 11078899.

It is an arithmetic number, because the mean of its divisors is an integer number (11078899).

Almost surely, 2^22157797 is an apocalyptic number.

It is an amenable number.

22157797 is a deficient number, since it is larger than the sum of its proper divisors (1).

22157797 is an equidigital number, since it uses as much as digits as its factorization.

22157797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 40.

The square root of 22157797 is about 4707.2069213069. The cubic root of 22157797 is about 280.8722671021.

The spelling of 22157797 in words is "twenty-two million, one hundred fifty-seven thousand, seven hundred ninety-seven".