231242100 has 72 divisors (see below), whose sum is σ = 678289920. Its totient is φ = 60814080.

The previous prime is 231242059. The next prime is 231242111. The reversal of 231242100 is 1242132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 231242100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16621 + ... + 27179.

Almost surely, 2^231242100 is an apocalyptic number.

231242100 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 231242100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339144960).

231242100 is an abundant number, since it is smaller than the sum of its proper divisors (447047820).

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

231242100 is a wasteful number, since it uses less digits than its factorization.

231242100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10649 (or 10642 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 231242100 is about 15206.6465731272. The cubic root of 231242100 is about 613.7935234323.

Adding to 231242100 its reverse (1242132), we get a palindrome (232484232).

The spelling of 231242100 in words is "two hundred thirty-one million, two hundred forty-two thousand, one hundred".