91974554047 has 2 divisors, whose sum is σ = 91974554048. Its totient is φ = 91974554046.

The previous prime is 91974554041. The next prime is 91974554143. The reversal of 91974554047 is 74045547919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91974554047 - 2¹⁵ = 91974521279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91974554041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987277023 + 45987277024.

It is an arithmetic number, because the mean of its divisors is an integer number (45987277024).

Almost surely, 2^91974554047 is an apocalyptic number.

91974554047 is a deficient number, since it is larger than the sum of its proper divisors (1).

91974554047 is an equidigital number, since it uses as much as digits as its factorization.

91974554047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 91974554047 in words is "ninety-one billion, nine hundred seventy-four million, five hundred fifty-four thousand, forty-seven".