27309719 has 2 divisors, whose sum is σ = 27309720. Its totient is φ = 27309718.

The previous prime is 27309691. The next prime is 27309721. The reversal of 27309719 is 91790372.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27309719 is a prime.

It is a super-2 number, since 2×27309719² = 1491641503717922, which contains 22 as substring.

Together with 27309721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27309019) 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, 13654859 + 13654860.

It is an arithmetic number, because the mean of its divisors is an integer number (13654860).

Almost surely, 2^27309719 is an apocalyptic number.

27309719 is a deficient number, since it is larger than the sum of its proper divisors (1).

27309719 is an equidigital number, since it uses as much as digits as its factorization.

27309719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 27309719 is about 5225.8701667761. The cubic root of 27309719 is about 301.1427489631.

The spelling of 27309719 in words is "twenty-seven million, three hundred nine thousand, seven hundred nineteen".