231311715 has 16 divisors (see below), whose sum is σ = 373765536. Its totient is φ = 122144000.

The previous prime is 231311699. The next prime is 231311723. The reversal of 231311715 is 517113132.

It is a happy number.

231311715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231311715 - 2⁴ = 231311699 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74826 + ... + 77855.

It is an arithmetic number, because the mean of its divisors is an integer number (23360346).

Almost surely, 2^231311715 is an apocalyptic number.

231311715 is a deficient number, since it is larger than the sum of its proper divisors (142453821).

231311715 is a wasteful number, since it uses less digits than its factorization.

231311715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152790.

The product of its digits is 630, while the sum is 24.

The square root of 231311715 is about 15208.9353670794. The cubic root of 231311715 is about 613.8551110483.

Adding to 231311715 its reverse (517113132), we get a palindrome (748424847).

It can be divided in two parts, 2313117 and 15, that added together give a palindrome (2313132).

The spelling of 231311715 in words is "two hundred thirty-one million, three hundred eleven thousand, seven hundred fifteen".