27691451 has 2 divisors, whose sum is σ = 27691452. Its totient is φ = 27691450.

The previous prime is 27691427. The next prime is 27691459. The reversal of 27691451 is 15419672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27691451 - 2¹⁰ = 27690427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27691459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845725 + 13845726.

It is an arithmetic number, because the mean of its divisors is an integer number (13845726).

Almost surely, 2^27691451 is an apocalyptic number.

27691451 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691451 is an equidigital number, since it uses as much as digits as its factorization.

27691451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 27691451 is about 5262.2667169196. The cubic root of 27691451 is about 302.5393742432.

The spelling of 27691451 in words is "twenty-seven million, six hundred ninety-one thousand, four hundred fifty-one".