22256431997 has 2 divisors, whose sum is σ = 22256431998. Its totient is φ = 22256431996.

The previous prime is 22256431957. The next prime is 22256432047. The reversal of 22256431997 is 79913465222.

It is a happy number.

It is an a-pointer prime, because the next prime (22256432047) can be obtained adding 22256431997 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20918993956 + 1337438041 = 144634^2 + 36571^2 .

It is a cyclic number.

It is not a de Polignac number, because 22256431997 - 2²⁶ = 22189323133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22256431957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11128215998 + 11128215999.

It is an arithmetic number, because the mean of its divisors is an integer number (11128215999).

Almost surely, 2^22256431997 is an apocalyptic number.

It is an amenable number.

22256431997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22256431997 is an equidigital number, since it uses as much as digits as its factorization.

22256431997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The spelling of 22256431997 in words is "twenty-two billion, two hundred fifty-six million, four hundred thirty-one thousand, nine hundred ninety-seven".