23918513 has 2 divisors, whose sum is σ = 23918514. Its totient is φ = 23918512.

The previous prime is 23918509. The next prime is 23918519. The reversal of 23918513 is 31581932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23493409 + 425104 = 4847^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 23918513 - 2² = 23918509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23918513.

It is not a weakly prime, because it can be changed into another prime (23918519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11959256 + 11959257.

It is an arithmetic number, because the mean of its divisors is an integer number (11959257).

Almost surely, 2^23918513 is an apocalyptic number.

It is an amenable number.

23918513 is a deficient number, since it is larger than the sum of its proper divisors (1).

23918513 is an equidigital number, since it uses as much as digits as its factorization.

23918513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 23918513 is about 4890.6556820124. The cubic root of 23918513 is about 288.1230866940.

The spelling of 23918513 in words is "twenty-three million, nine hundred eighteen thousand, five hundred thirteen".