27012991 has 4 divisors (see below), whose sum is σ = 27027000. Its totient is φ = 26998984.

The previous prime is 27012959. The next prime is 27013031. The reversal of 27012991 is 19921072.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27012991 - 2⁵ = 27012959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27012941) 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 3 ways as a sum of consecutive naturals, for example, 3541 + ... + 8158.

It is an arithmetic number, because the mean of its divisors is an integer number (6756750).

Almost surely, 2^27012991 is an apocalyptic number.

27012991 is a deficient number, since it is larger than the sum of its proper divisors (14009).

27012991 is a wasteful number, since it uses less digits than its factorization.

27012991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14008.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 27012991 is about 5197.4023319347. The cubic root of 27012991 is about 300.0481071001.

The spelling of 27012991 in words is "twenty-seven million, twelve thousand, nine hundred ninety-one".