130857981 has 4 divisors (see below), whose sum is σ = 174477312. Its totient is φ = 87238652.

The previous prime is 130857977. The next prime is 130857989. The reversal of 130857981 is 189758031.

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 130857981 - 2² = 130857977 is a prime.

It is a super-2 number, since 2×130857981² = 34247622382792722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130857989) 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, 21809661 + ... + 21809666.

It is an arithmetic number, because the mean of its divisors is an integer number (43619328).

Almost surely, 2^130857981 is an apocalyptic number.

It is an amenable number.

130857981 is a deficient number, since it is larger than the sum of its proper divisors (43619331).

130857981 is an equidigital number, since it uses as much as digits as its factorization.

130857981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43619330.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 130857981 is about 11439.3173310299. The cubic root of 130857981 is about 507.6917097877.

The spelling of 130857981 in words is "one hundred thirty million, eight hundred fifty-seven thousand, nine hundred eighty-one".