1231312100 has 36 divisors (see below), whose sum is σ = 2812580400. Its totient is φ = 466601760.

The previous prime is 1231312067. The next prime is 1231312111. The reversal of 1231312100 is 12131321.

It is a super-2 number, since 2×1231312100² = 3032258975212820000, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 322130 + ... + 325929.

Almost surely, 2^1231312100 is an apocalyptic number.

1231312100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231312100 is an abundant number, since it is smaller than the sum of its proper divisors (1581268300).

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

1231312100 is a wasteful number, since it uses less digits than its factorization.

1231312100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648092 (or 648085 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1231312100 is about 35090.0569962490. The cubic root of 1231312100 is about 1071.8221202313.

Adding to 1231312100 its reverse (12131321), we get a palindrome (1243443421).

The spelling of 1231312100 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, one hundred".