27331391 has 4 divisors (see below), whose sum is σ = 27342000. Its totient is φ = 27320784.

The previous prime is 27331373. The next prime is 27331397. The reversal of 27331391 is 19313372.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 27331391 - 2⁶ = 27331327 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 (27331397) 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 3 ways as a sum of consecutive naturals, for example, 1310 + ... + 7508.

It is an arithmetic number, because the mean of its divisors is an integer number (6835500).

Almost surely, 2^27331391 is an apocalyptic number.

27331391 is a deficient number, since it is larger than the sum of its proper divisors (10609).

27331391 is an equidigital number, since it uses as much as digits as its factorization.

27331391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10608.

The product of its digits is 3402, while the sum is 29.

The square root of 27331391 is about 5227.9432858439. The cubic root of 27331391 is about 301.2223865463. Note that the first 3 decimals are identical.

The spelling of 27331391 in words is "twenty-seven million, three hundred thirty-one thousand, three hundred ninety-one".