27997331 has 2 divisors, whose sum is σ = 27997332. Its totient is φ = 27997330.

The previous prime is 27997327. The next prime is 27997337. The reversal of 27997331 is 13379972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27997331 - 2² = 27997327 is a prime.

It is a super-3 number, since 3×27997331³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (27997337) 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 as a sum of consecutive naturals, namely, 13998665 + 13998666.

It is an arithmetic number, because the mean of its divisors is an integer number (13998666).

Almost surely, 2^27997331 is an apocalyptic number.

27997331 is a deficient number, since it is larger than the sum of its proper divisors (1).

27997331 is an equidigital number, since it uses as much as digits as its factorization.

27997331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 41.

The square root of 27997331 is about 5291.2504193243. The cubic root of 27997331 is about 303.6492484810.

The spelling of 27997331 in words is "twenty-seven million, nine hundred ninety-seven thousand, three hundred thirty-one".