23193581 has 2 divisors, whose sum is σ = 23193582. Its totient is φ = 23193580.

The previous prime is 23193571. The next prime is 23193601. The reversal of 23193581 is 18539132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 1188100 = 4691^2 + 1090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23193581 is a prime.

It is a super-2 number, since 2×23193581² = 1075884399207122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23193551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11596790 + 11596791.

It is an arithmetic number, because the mean of its divisors is an integer number (11596791).

Almost surely, 2^23193581 is an apocalyptic number.

It is an amenable number.

23193581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23193581 is an equidigital number, since it uses as much as digits as its factorization.

23193581 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 23193581 is about 4815.9714492509. The cubic root of 23193581 is about 285.1823230626.

The spelling of 23193581 in words is "twenty-three million, one hundred ninety-three thousand, five hundred eighty-one".