231231191 has 2 divisors, whose sum is σ = 231231192. Its totient is φ = 231231190.

The previous prime is 231231179. The next prime is 231231199. The reversal of 231231191 is 191132132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231231191 - 2¹⁸ = 230969047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231231199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115615595 + 115615596.

It is an arithmetic number, because the mean of its divisors is an integer number (115615596).

Almost surely, 2^231231191 is an apocalyptic number.

231231191 is a deficient number, since it is larger than the sum of its proper divisors (1).

231231191 is an equidigital number, since it uses as much as digits as its factorization.

231231191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 231231191 is about 15206.2878770593. The cubic root of 231231191 is about 613.7838712411.

The spelling of 231231191 in words is "two hundred thirty-one million, two hundred thirty-one thousand, one hundred ninety-one".