130817891 has 4 divisors (see below), whose sum is σ = 130938672. Its totient is φ = 130697112.

The previous prime is 130817887. The next prime is 130817893. The reversal of 130817891 is 198718031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198718031 = 12823 ⋅15497.

It is a cyclic number.

It is not a de Polignac number, because 130817891 - 2² = 130817887 is a prime.

It is a super-2 number, since 2×130817891² = 34226641211375762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130817893) 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, 58751 + ... + 60936.

It is an arithmetic number, because the mean of its divisors is an integer number (32734668).

Almost surely, 2^130817891 is an apocalyptic number.

130817891 is a deficient number, since it is larger than the sum of its proper divisors (120781).

130817891 is a wasteful number, since it uses less digits than its factorization.

130817891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120780.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 130817891 is about 11437.5649069197. The cubic root of 130817891 is about 507.6398585636.

The spelling of 130817891 in words is "one hundred thirty million, eight hundred seventeen thousand, eight hundred ninety-one".