23131393 has 2 divisors, whose sum is σ = 23131394. Its totient is φ = 23131392.

The previous prime is 23131391. The next prime is 23131429. The reversal of 23131393 is 39313132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 692224 = 4737^2 + 832^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131393 - 2¹ = 23131391 is a prime.

It is a super-2 number, since 2×23131393² = 1070122684240898, which contains 22 as substring.

Together with 23131391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23131391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565696 + 11565697.

It is an arithmetic number, because the mean of its divisors is an integer number (11565697).

Almost surely, 2^23131393 is an apocalyptic number.

It is an amenable number.

23131393 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131393 is an equidigital number, since it uses as much as digits as its factorization.

23131393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 25.

The square root of 23131393 is about 4809.5106819717. The cubic root of 23131393 is about 284.9272123548.

The spelling of 23131393 in words is "twenty-three million, one hundred thirty-one thousand, three hundred ninety-three".