231139512 has 96 divisors (see below), whose sum is σ = 675885600. Its totient is φ = 71140608.

The previous prime is 231139511. The next prime is 231139537. The reversal of 231139512 is 215931132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231139511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45618 + ... + 50430.

It is an arithmetic number, because the mean of its divisors is an integer number (7040475).

Almost surely, 2^231139512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231139512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337942800).

231139512 is an abundant number, since it is smaller than the sum of its proper divisors (444746088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231139512 is a wasteful number, since it uses less digits than its factorization.

231139512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4877 (or 4870 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 231139512 is about 15203.2730686520. The cubic root of 231139512 is about 613.7027424370.

Adding to 231139512 its product of digits (1620), we get a palindrome (231141132).

The spelling of 231139512 in words is "two hundred thirty-one million, one hundred thirty-nine thousand, five hundred twelve".