27129231 has 12 divisors (see below), whose sum is σ = 39429208. Its totient is φ = 17974224.

The previous prime is 27129227. The next prime is 27129233. The reversal of 27129231 is 13292172.

It is not a de Polignac number, because 27129231 - 2² = 27129227 is a prime.

It is a super-2 number, since 2×27129231² = 1471990349302722, 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 = 27129195 and 27129204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27129233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7780 + ... + 10713.

Almost surely, 2^27129231 is an apocalyptic number.

27129231 is a deficient number, since it is larger than the sum of its proper divisors (12299977).

27129231 is a wasteful number, since it uses less digits than its factorization.

27129231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18662 (or 18659 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 27129231 is about 5208.5728371599. The cubic root of 27129231 is about 300.4778717245.

The spelling of 27129231 in words is "twenty-seven million, one hundred twenty-nine thousand, two hundred thirty-one".