27691131 has 16 divisors (see below), whose sum is σ = 40610304. Its totient is φ = 16677024.

The previous prime is 27691117. The next prime is 27691187. The reversal of 27691131 is 13119672.

It is not a de Polignac number, because 27691131 - 2⁵ = 27691099 is a prime.

It is a super-2 number, since 2×27691131² = 1533597472118322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27691231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5721 + ... + 9386.

It is an arithmetic number, because the mean of its divisors is an integer number (2538144).

Almost surely, 2^27691131 is an apocalyptic number.

27691131 is a deficient number, since it is larger than the sum of its proper divisors (12919173).

27691131 is a wasteful number, since it uses less digits than its factorization.

27691131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15170.

The product of its digits is 2268, while the sum is 30.

The square root of 27691131 is about 5262.2363116835. The cubic root of 27691131 is about 302.5382088658.

The spelling of 27691131 in words is "twenty-seven million, six hundred ninety-one thousand, one hundred thirty-one".