23011997 has 2 divisors, whose sum is σ = 23011998. Its totient is φ = 23011996.

The previous prime is 23011991. The next prime is 23012047. The reversal of 23011997 is 79911032.

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., 21104836 + 1907161 = 4594^2 + 1381^2 .

It is a cyclic number.

It is not a de Polignac number, because 23011997 - 2¹⁰ = 23010973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23011991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11505998 + 11505999.

It is an arithmetic number, because the mean of its divisors is an integer number (11505999).

Almost surely, 2^23011997 is an apocalyptic number.

It is an amenable number.

23011997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23011997 is an equidigital number, since it uses as much as digits as its factorization.

23011997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 23011997 is about 4797.0821339644. The cubic root of 23011997 is about 284.4361355820.

The spelling of 23011997 in words is "twenty-three million, eleven thousand, nine hundred ninety-seven".