130781538 has 12 divisors (see below), whose sum is σ = 283360038. Its totient is φ = 43593840.

The previous prime is 130781537. The next prime is 130781549. The reversal of 130781538 is 835187031.

It can be written as a sum of positive squares in only one way, i.e., 130576329 + 205209 = 11427^2 + 453^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (130781531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3632803 + ... + 3632838.

Almost surely, 2^130781538 is an apocalyptic number.

130781538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

130781538 is an abundant number, since it is smaller than the sum of its proper divisors (152578500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

130781538 is a wasteful number, since it uses less digits than its factorization.

130781538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7265649 (or 7265646 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 130781538 is about 11435.9756033318. The cubic root of 130781538 is about 507.5928315061.

The spelling of 130781538 in words is "one hundred thirty million, seven hundred eighty-one thousand, five hundred thirty-eight".