23001997 has 2 divisors, whose sum is σ = 23001998. Its totient is φ = 23001996.

The previous prime is 23001991. The next prime is 23002009. The reversal of 23001997 is 79910032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22524516 + 477481 = 4746^2 + 691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23001997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23001991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11500998 + 11500999.

It is an arithmetic number, because the mean of its divisors is an integer number (11500999).

Almost surely, 2^23001997 is an apocalyptic number.

It is an amenable number.

23001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23001997 is an equidigital number, since it uses as much as digits as its factorization.

23001997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 23001997 is about 4796.0397204360. The cubic root of 23001997 is about 284.3949284750.

The spelling of 23001997 in words is "twenty-three million, one thousand, nine hundred ninety-seven".