23493581 has 2 divisors, whose sum is σ = 23493582. Its totient is φ = 23493580.

The previous prime is 23493577. The next prime is 23493583. The reversal of 23493581 is 18539432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23367556 + 126025 = 4834^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 23493581 - 2² = 23493577 is a prime.

It is a super-2 number, since 2×23493581² = 1103896696407122, which contains 22 as substring.

Together with 23493583, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23493583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11746790 + 11746791.

It is an arithmetic number, because the mean of its divisors is an integer number (11746791).

Almost surely, 2^23493581 is an apocalyptic number.

It is an amenable number.

23493581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23493581 is an equidigital number, since it uses as much as digits as its factorization.

23493581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 23493581 is about 4847.0177429013. The cubic root of 23493581 is about 286.4066338270.

The spelling of 23493581 in words is "twenty-three million, four hundred ninety-three thousand, five hundred eighty-one".