231133391 has 2 divisors, whose sum is σ = 231133392. Its totient is φ = 231133390.

The previous prime is 231133373. The next prime is 231133429. The reversal of 231133391 is 193331132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231133391 - 2⁶ = 231133327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231133391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231133351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115566695 + 115566696.

It is an arithmetic number, because the mean of its divisors is an integer number (115566696).

Almost surely, 2^231133391 is an apocalyptic number.

231133391 is a deficient number, since it is larger than the sum of its proper divisors (1).

231133391 is an equidigital number, since it uses as much as digits as its factorization.

231133391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 26.

The square root of 231133391 is about 15203.0717619828. The cubic root of 231133391 is about 613.6973250629.

The spelling of 231133391 in words is "two hundred thirty-one million, one hundred thirty-three thousand, three hundred ninety-one".