27491391 has 12 divisors (see below), whose sum is σ = 41079480. Its totient is φ = 17695440.

The previous prime is 27491383. The next prime is 27491393. The reversal of 27491391 is 19319472.

It is not a de Polignac number, because 27491391 - 2³ = 27491383 is a prime.

It is a super-2 number, since 2×27491391² = 1511553158229762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27491393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52405 + ... + 52926.

It is an arithmetic number, because the mean of its divisors is an integer number (3423290).

Almost surely, 2^27491391 is an apocalyptic number.

27491391 is a deficient number, since it is larger than the sum of its proper divisors (13588089).

27491391 is a wasteful number, since it uses less digits than its factorization.

27491391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105366 (or 105363 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 27491391 is about 5243.2233406560. The cubic root of 27491391 is about 301.8090360351.

The spelling of 27491391 in words is "twenty-seven million, four hundred ninety-one thousand, three hundred ninety-one".