130291981 has 4 divisors (see below), whose sum is σ = 130375872. Its totient is φ = 130208092.

The previous prime is 130291939. The next prime is 130291991. The reversal of 130291981 is 189192031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 130291981 - 2²⁵ = 96737549 is a prime.

It is a super-2 number, since 2×130291981² = 33952000625808722, 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 (130291901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39571 + ... + 42736.

It is an arithmetic number, because the mean of its divisors is an integer number (32593968).

Almost surely, 2^130291981 is an apocalyptic number.

It is an amenable number.

130291981 is a deficient number, since it is larger than the sum of its proper divisors (83891).

130291981 is an equidigital number, since it uses as much as digits as its factorization.

130291981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83890.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 130291981 is about 11414.5512833401. The cubic root of 130291981 is about 506.9586789588.

The spelling of 130291981 in words is "one hundred thirty million, two hundred ninety-one thousand, nine hundred eighty-one".