231323381 has 2 divisors, whose sum is σ = 231323382. Its totient is φ = 231323380.

The previous prime is 231323377. The next prime is 231323413. The reversal of 231323381 is 183323132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139948900 + 91374481 = 11830^2 + 9559^2 .

It is a cyclic number.

It is not a de Polignac number, because 231323381 - 2² = 231323377 is a prime.

It is a super-2 number, since 2×231323381² = 107021013194542322, 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 231323381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231323321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115661690 + 115661691.

It is an arithmetic number, because the mean of its divisors is an integer number (115661691).

Almost surely, 2^231323381 is an apocalyptic number.

It is an amenable number.

231323381 is a deficient number, since it is larger than the sum of its proper divisors (1).

231323381 is an equidigital number, since it uses as much as digits as its factorization.

231323381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 231323381 is about 15209.3188867878. The cubic root of 231323381 is about 613.8654306198.

The spelling of 231323381 in words is "two hundred thirty-one million, three hundred twenty-three thousand, three hundred eighty-one".