27971899243 has 2 divisors, whose sum is σ = 27971899244. Its totient is φ = 27971899242.

The previous prime is 27971899217. The next prime is 27971899283. The reversal of 27971899243 is 34299817972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27971899243 - 2¹⁷ = 27971768171 is a prime.

It is not a weakly prime, because it can be changed into another prime (27971899283) 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, 13985949621 + 13985949622.

It is an arithmetic number, because the mean of its divisors is an integer number (13985949622).

Almost surely, 2^27971899243 is an apocalyptic number.

27971899243 is a deficient number, since it is larger than the sum of its proper divisors (1).

27971899243 is an equidigital number, since it uses as much as digits as its factorization.

27971899243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 61.

The spelling of 27971899243 in words is "twenty-seven billion, nine hundred seventy-one million, eight hundred ninety-nine thousand, two hundred forty-three".