23897515217 has 2 divisors, whose sum is σ = 23897515218. Its totient is φ = 23897515216.

The previous prime is 23897515171. The next prime is 23897515253. The reversal of 23897515217 is 71251579832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13014018241 + 10883496976 = 114079^2 + 104324^2 .

It is a cyclic number.

It is not a de Polignac number, because 23897515217 - 2²⁰ = 23896466641 is a prime.

It is not a weakly prime, because it can be changed into another prime (23897514217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11948757608 + 11948757609.

It is an arithmetic number, because the mean of its divisors is an integer number (11948757609).

Almost surely, 2^23897515217 is an apocalyptic number.

It is an amenable number.

23897515217 is a deficient number, since it is larger than the sum of its proper divisors (1).

23897515217 is an equidigital number, since it uses as much as digits as its factorization.

23897515217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 50.

The spelling of 23897515217 in words is "twenty-three billion, eight hundred ninety-seven million, five hundred fifteen thousand, two hundred seventeen".