231211015 has 16 divisors (see below), whose sum is σ = 318231360. Its totient is φ = 157973760.

The previous prime is 231211007. The next prime is 231211027. The reversal of 231211015 is 510112132.

It is not a de Polignac number, because 231211015 - 2³ = 231211007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231211015.

It is a congruent number.

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, 1920 + ... + 21589.

It is an arithmetic number, because the mean of its divisors is an integer number (19889460).

Almost surely, 2^231211015 is an apocalyptic number.

231211015 is a deficient number, since it is larger than the sum of its proper divisors (87020345).

231211015 is a wasteful number, since it uses less digits than its factorization.

231211015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23802.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 231211015 is about 15205.6244528135. The cubic root of 231211015 is about 613.7660188866.

Adding to 231211015 its reverse (510112132), we get a palindrome (741323147).

The spelling of 231211015 in words is "two hundred thirty-one million, two hundred eleven thousand, fifteen".