1231232100 has 72 divisors (see below), whose sum is σ = 4071281088. Its totient is φ = 281424000.

The previous prime is 1231232059. The next prime is 1231232111. The reversal of 1231232100 is 12321321.

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 1231232100.

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 23 ways as a sum of consecutive naturals, for example, 291051 + ... + 295250.

Almost surely, 2^1231232100 is an apocalyptic number.

1231232100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231232100 is an abundant number, since it is smaller than the sum of its proper divisors (2840048988).

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

1231232100 is a wasteful number, since it uses less digits than its factorization.

1231232100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586325 (or 586318 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231232100 is about 35088.9170536795. The cubic root of 1231232100 is about 1071.7989071545.

Adding to 1231232100 its reverse (12321321), we get a palindrome (1243553421).

The spelling of 1231232100 in words is "one billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred".