27381491 has 2 divisors, whose sum is σ = 27381492. Its totient is φ = 27381490.

The previous prime is 27381469. The next prime is 27381521. The reversal of 27381491 is 19418372.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27381491 - 2⁶ = 27381427 is a prime.

It is not a weakly prime, because it can be changed into another prime (27381391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13690745 + 13690746.

It is an arithmetic number, because the mean of its divisors is an integer number (13690746).

Almost surely, 2^27381491 is an apocalyptic number.

27381491 is a deficient number, since it is larger than the sum of its proper divisors (1).

27381491 is an equidigital number, since it uses as much as digits as its factorization.

27381491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 27381491 is about 5232.7326513018. The cubic root of 27381491 is about 301.4063268113.

It can be divided in two parts, 27381 and 491, that added together give a palindrome (27872).

The spelling of 27381491 in words is "twenty-seven million, three hundred eighty-one thousand, four hundred ninety-one".