231306397 has 8 divisors (see below), whose sum is σ = 264873600. Its totient is φ = 197870064.

The previous prime is 231306389. The next prime is 231306401. The reversal of 231306397 is 793603132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231306397 - 2³ = 231306389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231306197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28897 + ... + 36022.

It is an arithmetic number, because the mean of its divisors is an integer number (33109200).

Almost surely, 2^231306397 is an apocalyptic number.

It is an amenable number.

231306397 is a deficient number, since it is larger than the sum of its proper divisors (33567203).

231306397 is an equidigital number, since it uses as much as digits as its factorization.

231306397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65435.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 231306397 is about 15208.7605346392. The cubic root of 231306397 is about 613.8504067088.

It can be divided in two parts, 231 and 306397, that multiplied together give a palindrome (70777707).

The spelling of 231306397 in words is "two hundred thirty-one million, three hundred six thousand, three hundred ninety-seven".