130781 has 12 divisors (see below), whose sum is σ = 162108. Its totient is φ = 104832.

The previous prime is 130769. The next prime is 130783. The reversal of 130781 is 187031.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 60025 = 266^2 + 245^2 .

It is not a de Polignac number, because 130781 - 2¹⁰ = 129757 is a prime.

It is a super-2 number, since 2×130781² = 34207339922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130783) 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, 755 + ... + 911.

It is an arithmetic number, because the mean of its divisors is an integer number (13509).

2¹³⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

130781 is a deficient number, since it is larger than the sum of its proper divisors (31327).

130781 is a wasteful number, since it uses less digits than its factorization.

130781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 130781 is about 361.6365578865. The cubic root of 130781 is about 50.7592135472.

The spelling of 130781 in words is "one hundred thirty thousand, seven hundred eighty-one".