231243100 has 108 divisors (see below), whose sum is σ = 571447800. Its totient is φ = 81065600.

The previous prime is 231243097. The next prime is 231243109. The reversal of 231243100 is 1342132.

It is a happy number.

It is a super-2 number, since 2×231243100² = 106946742595220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231243109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 350571 + ... + 351229.

Almost surely, 2^231243100 is an apocalyptic number.

231243100 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 231243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285723900).

231243100 is an abundant number, since it is smaller than the sum of its proper divisors (340204700).

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

231243100 is a wasteful number, since it uses less digits than its factorization.

231243100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231243100 is about 15206.6794534507. The cubic root of 231243100 is about 613.7944082086.

Adding to 231243100 its reverse (1342132), we get a palindrome (232585232).

The spelling of 231243100 in words is "two hundred thirty-one million, two hundred forty-three thousand, one hundred".