23613281 has 2 divisors, whose sum is σ = 23613282. Its totient is φ = 23613280.

The previous prime is 23613277. The next prime is 23613301. The reversal of 23613281 is 18231632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14371681 + 9241600 = 3791^2 + 3040^2 .

It is a cyclic number.

It is not a de Polignac number, because 23613281 - 2² = 23613277 is a prime.

It is a super-2 number, since 2×23613281² = 1115174079169922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23613281.

It is not a weakly prime, because it can be changed into another prime (23613481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11806640 + 11806641.

It is an arithmetic number, because the mean of its divisors is an integer number (11806641).

Almost surely, 2^23613281 is an apocalyptic number.

It is an amenable number.

23613281 is a deficient number, since it is larger than the sum of its proper divisors (1).

23613281 is an equidigital number, since it uses as much as digits as its factorization.

23613281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 23613281 is about 4859.3498536327. The cubic root of 23613281 is about 286.8922248270.

The spelling of 23613281 in words is "twenty-three million, six hundred thirteen thousand, two hundred eighty-one".