28130131 has 4 divisors (see below), whose sum is σ = 28253200. Its totient is φ = 28007064.

The previous prime is 28130099. The next prime is 28130143. The reversal of 28130131 is 13103182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13103182 = 2 ⋅6551591.

It is a cyclic number.

It is not a de Polignac number, because 28130131 - 2⁵ = 28130099 is a prime.

It is a super-2 number, since 2×28130131² = 1582608540154322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28130099 and 28130108.

It is not an unprimeable number, because it can be changed into a prime (28130191) 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, 61191 + ... + 61648.

It is an arithmetic number, because the mean of its divisors is an integer number (7063300).

Almost surely, 2^28130131 is an apocalyptic number.

28130131 is a deficient number, since it is larger than the sum of its proper divisors (123069).

28130131 is a wasteful number, since it uses less digits than its factorization.

28130131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123068.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 28130131 is about 5303.7845921568. The cubic root of 28130131 is about 304.1285921525.

The spelling of 28130131 in words is "twenty-eight million, one hundred thirty thousand, one hundred thirty-one".