231296391 has 14 divisors (see below), whose sum is σ = 346787040. Its totient is φ = 154197108.

The previous prime is 231296371. The next prime is 231296413. The reversal of 231296391 is 193692132.

It is a happy number.

231296391 is a `hidden beast` number, since 2 + 3 + 12 + 9 + 639 + 1 = 666.

It is not a de Polignac number, because 231296391 - 2⁶ = 231296327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231296311) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 157911 + ... + 159368.

Almost surely, 2^231296391 is an apocalyptic number.

231296391 is a deficient number, since it is larger than the sum of its proper divisors (115490649).

231296391 is an frugal number, since it uses more digits than its factorization.

231296391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317297 (or 317282 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 231296391 is about 15208.4315759384. The cubic root of 231296391 is about 613.8415551367.

The spelling of 231296391 in words is "two hundred thirty-one million, two hundred ninety-six thousand, three hundred ninety-one".