22911997 has 2 divisors, whose sum is σ = 22911998. Its totient is φ = 22911996.

The previous prime is 22911961. The next prime is 22912003. The reversal of 22911997 is 79911922.

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., 18198756 + 4713241 = 4266^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 22911997 - 2¹¹ = 22909949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22911797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11455998 + 11455999.

It is an arithmetic number, because the mean of its divisors is an integer number (11455999).

Almost surely, 2^22911997 is an apocalyptic number.

It is an amenable number.

22911997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22911997 is an equidigital number, since it uses as much as digits as its factorization.

22911997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 40.

The square root of 22911997 is about 4786.6477831568. The cubic root of 22911997 is about 284.0235259556.

The spelling of 22911997 in words is "twenty-two million, nine hundred eleven thousand, nine hundred ninety-seven".