28271556091 has 2 divisors, whose sum is σ = 28271556092. Its totient is φ = 28271556090.

The previous prime is 28271556083. The next prime is 28271556161. The reversal of 28271556091 is 19065517282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28271556091 - 2³ = 28271556083 is a prime.

It is not a weakly prime, because it can be changed into another prime (28271550091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14135778045 + 14135778046.

It is an arithmetic number, because the mean of its divisors is an integer number (14135778046).

Almost surely, 2^28271556091 is an apocalyptic number.

28271556091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28271556091 is an equidigital number, since it uses as much as digits as its factorization.

28271556091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 28271556091 in words is "twenty-eight billion, two hundred seventy-one million, five hundred fifty-six thousand, ninety-one".