231307311 has 16 divisors (see below), whose sum is σ = 324979200. Its totient is φ = 145937088.

The previous prime is 231307309. The next prime is 231307319. The reversal of 231307311 is 113703132.

It is not a de Polignac number, because 231307311 - 2¹ = 231307309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231307319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83395 + ... + 86123.

It is an arithmetic number, because the mean of its divisors is an integer number (20311200).

Almost surely, 2^231307311 is an apocalyptic number.

231307311 is a deficient number, since it is larger than the sum of its proper divisors (93671889).

231307311 is a wasteful number, since it uses less digits than its factorization.

231307311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 231307311 is about 15208.7905830806. The cubic root of 231307311 is about 613.8512152447.

The spelling of 231307311 in words is "two hundred thirty-one million, three hundred seven thousand, three hundred eleven".