1231310987900 has 72 divisors (see below), whose sum is σ = 3083885597856. Its totient is φ = 417983904000.

The previous prime is 1231310987861. The next prime is 1231310987941. The reversal of 1231310987900 is 97890131321.

It is a super-2 number, since 2×1231310987900² (a number of 25 digits) contains 22 as substring.

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, 8637299 + ... + 8778698.

Almost surely, 2^{1231310987900} is an apocalyptic number.

1231310987900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231310987900 is an abundant number, since it is smaller than the sum of its proper divisors (1852574609956).

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

1231310987900 is a wasteful number, since it uses less digits than its factorization.

1231310987900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17416119 (or 17416112 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 1231310987900 in words is "one trillion, two hundred thirty-one billion, three hundred ten million, nine hundred eighty-seven thousand, nine hundred".