187031131540 has 24 divisors (see below), whose sum is σ = 428471320032. Its totient is φ = 68011320480.

The previous prime is 187031131523. The next prime is 187031131543. The reversal of 187031131540 is 45131130781.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 187031131496 and 187031131505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187031131543) 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, 425070534 + ... + 425070973.

It is an arithmetic number, because the mean of its divisors is an integer number (17852971668).

Almost surely, 2^187031131540 is an apocalyptic number.

187031131540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187031131540 is an abundant number, since it is smaller than the sum of its proper divisors (241440188492).

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

187031131540 is a wasteful number, since it uses less digits than its factorization.

187031131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850141527 (or 850141525 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 187031131540 in words is "one hundred eighty-seven billion, thirty-one million, one hundred thirty-one thousand, five hundred forty".