12393581 has 2 divisors, whose sum is σ = 12393582. Its totient is φ = 12393580.

The previous prime is 12393569. The next prime is 12393587. The reversal of 12393581 is 18539321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9030025 + 3363556 = 3005^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 12393581 - 2¹⁸ = 12131437 is a prime.

It is a super-2 number, since 2×12393581² = 307201700007122, 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 (12393587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6196790 + 6196791.

It is an arithmetic number, because the mean of its divisors is an integer number (6196791).

Almost surely, 2^12393581 is an apocalyptic number.

It is an amenable number.

12393581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12393581 is an equidigital number, since it uses as much as digits as its factorization.

12393581 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 12393581 is about 3520.4518175939. The cubic root of 12393581 is about 231.4189594537.

The spelling of 12393581 in words is "twelve million, three hundred ninety-three thousand, five hundred eighty-one".