231513311000 has 128 divisors (see below), whose sum is σ = 553716596160. Its totient is φ = 90580480000.

The previous prime is 231513310999. The next prime is 231513311011. The reversal of 231513311000 is 113315132.

231513311000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8369192 + ... + 8396808.

Almost surely, 2^231513311000 is an apocalyptic number.

231513311000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231513311000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276858298080).

231513311000 is an abundant number, since it is smaller than the sum of its proper divisors (322203285160).

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

231513311000 is a wasteful number, since it uses less digits than its factorization.

231513311000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27822 (or 27808 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 20.

Adding to 231513311000 its reverse (113315132), we get a palindrome (231626626132).

The spelling of 231513311000 in words is "two hundred thirty-one billion, five hundred thirteen million, three hundred eleven thousand".