22749997 has 2 divisors, whose sum is σ = 22749998. Its totient is φ = 22749996.

The previous prime is 22749989. The next prime is 22750003. The reversal of 22749997 is 79994722.

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., 20848356 + 1901641 = 4566^2 + 1379^2 .

It is a cyclic number.

It is not a de Polignac number, because 22749997 - 2³ = 22749989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22749997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22749907) 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, 11374998 + 11374999.

It is an arithmetic number, because the mean of its divisors is an integer number (11374999).

Almost surely, 2^22749997 is an apocalyptic number.

It is an amenable number.

22749997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22749997 is an equidigital number, since it uses as much as digits as its factorization.

22749997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 49.

The square root of 22749997 is about 4769.6956925993. The cubic root of 22749997 is about 283.3525429498.

The spelling of 22749997 in words is "twenty-two million, seven hundred forty-nine thousand, nine hundred ninety-seven".