131340781 has 12 divisors (see below), whose sum is σ = 155473276. Its totient is φ = 110214720.

The previous prime is 131340773. The next prime is 131340799. The reversal of 131340781 is 187043131.

It can be written as a sum of positive squares in 2 ways, for example, as 34633225 + 96707556 = 5885^2 + 9834^2 .

It is not a de Polignac number, because 131340781 - 2³ = 131340773 is a prime.

It is a super-2 number, since 2×131340781² = 34500801507379922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131340721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40176 + ... + 43321.

Almost surely, 2^131340781 is an apocalyptic number.

131340781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131340781 is a deficient number, since it is larger than the sum of its proper divisors (24132495).

131340781 is a wasteful number, since it uses less digits than its factorization.

131340781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83532 (or 83521 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 131340781 is about 11460.4005601899. The cubic root of 131340781 is about 508.3153189949.

The spelling of 131340781 in words is "one hundred thirty-one million, three hundred forty thousand, seven hundred eighty-one".