131987631540 has 24 divisors (see below), whose sum is σ = 369565368480. Its totient is φ = 35196701728.

The previous prime is 131987631511. The next prime is 131987631547. The reversal of 131987631540 is 45136789131.

It is a self number, because there is not a number n which added to its sum of digits gives 131987631540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131987631547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099896870 + ... + 1099896989.

It is an arithmetic number, because the mean of its divisors is an integer number (15398557020).

Almost surely, 2^131987631540 is an apocalyptic number.

131987631540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131987631540 is an abundant number, since it is smaller than the sum of its proper divisors (237577736940).

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

131987631540 is a wasteful number, since it uses less digits than its factorization.

131987631540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199793871 (or 2199793869 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 131987631540 in words is "one hundred thirty-one billion, nine hundred eighty-seven million, six hundred thirty-one thousand, five hundred forty".