231301391 has 2 divisors, whose sum is σ = 231301392. Its totient is φ = 231301390.

The previous prime is 231301339. The next prime is 231301453. The reversal of 231301391 is 193103132.

231301391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231301391 - 2¹⁰ = 231300367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231301321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115650695 + 115650696.

It is an arithmetic number, because the mean of its divisors is an integer number (115650696).

Almost surely, 2^231301391 is an apocalyptic number.

231301391 is a deficient number, since it is larger than the sum of its proper divisors (1).

231301391 is an equidigital number, since it uses as much as digits as its factorization.

231301391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 231301391 is about 15208.5959575498. The cubic root of 231301391 is about 613.8459783008.

The spelling of 231301391 in words is "two hundred thirty-one million, three hundred one thousand, three hundred ninety-one".