23513381 has 2 divisors, whose sum is σ = 23513382. Its totient is φ = 23513380.

The previous prime is 23513353. The next prime is 23513387. The reversal of 23513381 is 18331532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21436900 + 2076481 = 4630^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 23513381 - 2¹⁸ = 23251237 is a prime.

It is a super-2 number, since 2×23513381² = 1105758172102322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23513381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23513387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11756690 + 11756691.

It is an arithmetic number, because the mean of its divisors is an integer number (11756691).

Almost surely, 2^23513381 is an apocalyptic number.

It is an amenable number.

23513381 is a deficient number, since it is larger than the sum of its proper divisors (1).

23513381 is an equidigital number, since it uses as much as digits as its factorization.

23513381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 23513381 is about 4849.0598057768. The cubic root of 23513381 is about 286.4870708195.

The spelling of 23513381 in words is "twenty-three million, five hundred thirteen thousand, three hundred eighty-one".