23211997 has 2 divisors, whose sum is σ = 23211998. Its totient is φ = 23211996.

The previous prime is 23211989. The next prime is 23212009. The reversal of 23211997 is 79911232.

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., 17480761 + 5731236 = 4181^2 + 2394^2 .

It is a cyclic number.

It is not a de Polignac number, because 23211997 - 2³ = 23211989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23212997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11605998 + 11605999.

It is an arithmetic number, because the mean of its divisors is an integer number (11605999).

Almost surely, 2^23211997 is an apocalyptic number.

It is an amenable number.

23211997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23211997 is an equidigital number, since it uses as much as digits as its factorization.

23211997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 23211997 is about 4817.8830413367. The cubic root of 23211997 is about 285.2577825650.

The spelling of 23211997 in words is "twenty-three million, two hundred eleven thousand, nine hundred ninety-seven".