22981997 has 2 divisors, whose sum is σ = 22981998. Its totient is φ = 22981996.

The previous prime is 22981957. The next prime is 22982009. The reversal of 22981997 is 79918922.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 6180196 = 4099^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22981997 - 2⁸ = 22981741 is a prime.

It is a super-2 number, since 2×22981997² = 1056344372216018, which contains 22 as substring.

It is a Chen 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, 11490998 + 11490999.

It is an arithmetic number, because the mean of its divisors is an integer number (11490999).

Almost surely, 2^22981997 is an apocalyptic number.

It is an amenable number.

22981997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22981997 is an equidigital number, since it uses as much as digits as its factorization.

22981997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 22981997 is about 4793.9542133817. The cubic root of 22981997 is about 284.3124784180.

The spelling of 22981997 in words is "twenty-two million, nine hundred eighty-one thousand, nine hundred ninety-seven".