231213500 has 96 divisors (see below), whose sum is σ = 596004864. Its totient is φ = 76680000.

The previous prime is 231213497. The next prime is 231213551. The reversal of 231213500 is 5312132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107435 + ... + 109565.

It is an arithmetic number, because the mean of its divisors is an integer number (6208384).

Almost surely, 2^231213500 is an apocalyptic number.

231213500 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 231213500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298002432).

231213500 is an abundant number, since it is smaller than the sum of its proper divisors (364791364).

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

231213500 is a wasteful number, since it uses less digits than its factorization.

231213500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 231213500 is about 15205.7061657787. The cubic root of 231213500 is about 613.7682177483.

Adding to 231213500 its reverse (5312132), we get a palindrome (236525632).

The spelling of 231213500 in words is "two hundred thirty-one million, two hundred thirteen thousand, five hundred".