91974554863 has 2 divisors, whose sum is σ = 91974554864. Its totient is φ = 91974554862.

The previous prime is 91974554803. The next prime is 91974554873. The reversal of 91974554863 is 36845547919.

It is a strong prime.

It is an emirp because it is prime and its reverse (36845547919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91974554863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91974554803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987277431 + 45987277432.

It is an arithmetic number, because the mean of its divisors is an integer number (45987277432).

Almost surely, 2^91974554863 is an apocalyptic number.

91974554863 is a deficient number, since it is larger than the sum of its proper divisors (1).

91974554863 is an equidigital number, since it uses as much as digits as its factorization.

91974554863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 61.

The spelling of 91974554863 in words is "ninety-one billion, nine hundred seventy-four million, five hundred fifty-four thousand, eight hundred sixty-three".