231343381 has 2 divisors, whose sum is σ = 231343382. Its totient is φ = 231343380.

The previous prime is 231343339. The next prime is 231343391. The reversal of 231343381 is 183343132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188650225 + 42693156 = 13735^2 + 6534^2 .

It is a cyclic number.

It is not a de Polignac number, because 231343381 - 2¹⁷ = 231212309 is a prime.

It is a super-2 number, since 2×231343381² = 107039519865022322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231343391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115671690 + 115671691.

It is an arithmetic number, because the mean of its divisors is an integer number (115671691).

Almost surely, 2^231343381 is an apocalyptic number.

It is an amenable number.

231343381 is a deficient number, since it is larger than the sum of its proper divisors (1).

231343381 is an equidigital number, since it uses as much as digits as its factorization.

231343381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 231343381 is about 15209.9763642157. The cubic root of 231343381 is about 613.8831215175.

The spelling of 231343381 in words is "two hundred thirty-one million, three hundred forty-three thousand, three hundred eighty-one".