23985517 has 2 divisors, whose sum is σ = 23985518. Its totient is φ = 23985516.

The previous prime is 23985497. The next prime is 23985541. The reversal of 23985517 is 71558932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 6295081 = 4206^2 + 2509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23985517 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 23985517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23985547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11992758 + 11992759.

It is an arithmetic number, because the mean of its divisors is an integer number (11992759).

Almost surely, 2^23985517 is an apocalyptic number.

It is an amenable number.

23985517 is a deficient number, since it is larger than the sum of its proper divisors (1).

23985517 is an equidigital number, since it uses as much as digits as its factorization.

23985517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 23985517 is about 4897.5010974986. The cubic root of 23985517 is about 288.3918798847.

The spelling of 23985517 in words is "twenty-three million, nine hundred eighty-five thousand, five hundred seventeen".