231310091 has 2 divisors, whose sum is σ = 231310092. Its totient is φ = 231310090.

The previous prime is 231310019. The next prime is 231310117. The reversal of 231310091 is 190013132.

Together with previous prime (231310019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231310091 - 2²² = 227115787 is a prime.

It is not a weakly prime, because it can be changed into another prime (231310291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655045 + 115655046.

It is an arithmetic number, because the mean of its divisors is an integer number (115655046).

Almost surely, 2^231310091 is an apocalyptic number.

231310091 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310091 is an equidigital number, since it uses as much as digits as its factorization.

231310091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 231310091 is about 15208.8819773184. The cubic root of 231310091 is about 613.8536744543.

The spelling of 231310091 in words is "two hundred thirty-one million, three hundred ten thousand, ninety-one".