131991382687 has 8 divisors (see below), whose sum is σ = 138554873856. Its totient is φ = 125496619512.

The previous prime is 131991382603. The next prime is 131991382723. The reversal of 131991382687 is 786283199131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131991382687 - 2⁷ = 131991382559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131991382487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17178063 + ... + 17185744.

It is an arithmetic number, because the mean of its divisors is an integer number (17319359232).

Almost surely, 2^131991382687 is an apocalyptic number.

131991382687 is a deficient number, since it is larger than the sum of its proper divisors (6563491169).

131991382687 is a wasteful number, since it uses less digits than its factorization.

131991382687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34363997.

The product of its digits is 3919104, while the sum is 58.

The spelling of 131991382687 in words is "one hundred thirty-one billion, nine hundred ninety-one million, three hundred eighty-two thousand, six hundred eighty-seven".