27115891 has 4 divisors (see below), whose sum is σ = 29580984. Its totient is φ = 24650800.

The previous prime is 27115871. The next prime is 27115909. The reversal of 27115891 is 19851172.

It is a happy number.

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 27115891 - 2⁵ = 27115859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27115811) 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, 1232530 + ... + 1232551.

It is an arithmetic number, because the mean of its divisors is an integer number (7395246).

Almost surely, 2^27115891 is an apocalyptic number.

27115891 is a deficient number, since it is larger than the sum of its proper divisors (2465093).

27115891 is a wasteful number, since it uses less digits than its factorization.

27115891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465092.

The product of its digits is 5040, while the sum is 34.

The square root of 27115891 is about 5207.2920985864. The cubic root of 27115891 is about 300.4286132698.

The spelling of 27115891 in words is "twenty-seven million, one hundred fifteen thousand, eight hundred ninety-one".