131447681 has 24 divisors (see below), whose sum is σ = 145170144. Its totient is φ = 118906560.

The previous prime is 131447677. The next prime is 131447731. The reversal of 131447681 is 186744131.

It is a happy number.

It is not a de Polignac number, because 131447681 - 2² = 131447677 is a prime.

It is a super-2 number, since 2×131447681² = 34556985680555522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131447611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1228430 + ... + 1228536.

It is an arithmetic number, because the mean of its divisors is an integer number (6048756).

Almost surely, 2^131447681 is an apocalyptic number.

It is an amenable number.

131447681 is a deficient number, since it is larger than the sum of its proper divisors (13722463).

131447681 is a wasteful number, since it uses less digits than its factorization.

131447681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 250 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 131447681 is about 11465.0634974256. The cubic root of 131447681 is about 508.4531897854.

The spelling of 131447681 in words is "one hundred thirty-one million, four hundred forty-seven thousand, six hundred eighty-one".