231400381 has 2 divisors, whose sum is σ = 231400382. Its totient is φ = 231400380.

The previous prime is 231400363. The next prime is 231400391. The reversal of 231400381 is 183004132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187443481 + 43956900 = 13691^2 + 6630^2 .

It is a cyclic number.

It is not a de Polignac number, because 231400381 - 2⁵ = 231400349 is a prime.

It is a super-2 number, since 2×231400381² = 107092272653890322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231400321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115700190 + 115700191.

It is an arithmetic number, because the mean of its divisors is an integer number (115700191).

Almost surely, 2^231400381 is an apocalyptic number.

It is an amenable number.

231400381 is a deficient number, since it is larger than the sum of its proper divisors (1).

231400381 is an equidigital number, since it uses as much as digits as its factorization.

231400381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 231400381 is about 15211.8500189819. The cubic root of 231400381 is about 613.9335349828.

The spelling of 231400381 in words is "two hundred thirty-one million, four hundred thousand, three hundred eighty-one".