91864687027 has 2 divisors, whose sum is σ = 91864687028. Its totient is φ = 91864687026.

The previous prime is 91864687003. The next prime is 91864687073. The reversal of 91864687027 is 72078646819.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91864687027 is a prime.

It is not a weakly prime, because it can be changed into another prime (91864687627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932343513 + 45932343514.

It is an arithmetic number, because the mean of its divisors is an integer number (45932343514).

Almost surely, 2^91864687027 is an apocalyptic number.

91864687027 is a deficient number, since it is larger than the sum of its proper divisors (1).

91864687027 is an equidigital number, since it uses as much as digits as its factorization.

91864687027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 91864687027 in words is "ninety-one billion, eight hundred sixty-four million, six hundred eighty-seven thousand, twenty-seven".