131917681 has 8 divisors (see below), whose sum is σ = 150879744. Its totient is φ = 112984800.

The previous prime is 131917661. The next prime is 131917699. The reversal of 131917681 is 186719131.

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 131917681 - 2⁷ = 131917553 is a prime.

It is a super-2 number, since 2×131917681² = 34804549120835522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131917681.

It is not an unprimeable number, because it can be changed into a prime (131917601) 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, 3456 + ... + 16606.

It is an arithmetic number, because the mean of its divisors is an integer number (18859968).

Almost surely, 2^131917681 is an apocalyptic number.

It is an amenable number.

131917681 is a deficient number, since it is larger than the sum of its proper divisors (18962063).

131917681 is a wasteful number, since it uses less digits than its factorization.

131917681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14591.

The product of its digits is 9072, while the sum is 37.

The square root of 131917681 is about 11485.5422597281. The cubic root of 131917681 is about 509.0584717766.

The spelling of 131917681 in words is "one hundred thirty-one million, nine hundred seventeen thousand, six hundred eighty-one".