27243919 has 2 divisors, whose sum is σ = 27243920. Its totient is φ = 27243918.

The previous prime is 27243917. The next prime is 27243943. The reversal of 27243919 is 91934272.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27243919 - 2¹ = 27243917 is a prime.

It is a super-2 number, since 2×27243919² = 1484462244957122, which contains 22 as substring.

Together with 27243917, 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 (27243917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13621959 + 13621960.

It is an arithmetic number, because the mean of its divisors is an integer number (13621960).

Almost surely, 2^27243919 is an apocalyptic number.

27243919 is a deficient number, since it is larger than the sum of its proper divisors (1).

27243919 is an equidigital number, since it uses as much as digits as its factorization.

27243919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 27243919 is about 5219.5707677931. The cubic root of 27243919 is about 300.9006968149.

The spelling of 27243919 in words is "twenty-seven million, two hundred forty-three thousand, nine hundred nineteen".