27975130891 has 2 divisors, whose sum is σ = 27975130892. Its totient is φ = 27975130890.

The previous prime is 27975130819. The next prime is 27975130901. The reversal of 27975130891 is 19803157972.

Together with previous prime (27975130819) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27975130891 - 2²³ = 27966742283 is a prime.

It is not a weakly prime, because it can be changed into another prime (27975130801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13987565445 + 13987565446.

It is an arithmetic number, because the mean of its divisors is an integer number (13987565446).

Almost surely, 2^27975130891 is an apocalyptic number.

27975130891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27975130891 is an equidigital number, since it uses as much as digits as its factorization.

27975130891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 27975130891 in words is "twenty-seven billion, nine hundred seventy-five million, one hundred thirty thousand, eight hundred ninety-one".