91347887 has 2 divisors, whose sum is σ = 91347888. Its totient is φ = 91347886.

The previous prime is 91347869. The next prime is 91347889. The reversal of 91347887 is 78874319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91347887 - 2²⁶ = 24239023 is a prime.

Together with 91347889, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 91347887 parts by 13516 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91347889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45673943 + 45673944.

It is an arithmetic number, because the mean of its divisors is an integer number (45673944).

Almost surely, 2^91347887 is an apocalyptic number.

91347887 is a deficient number, since it is larger than the sum of its proper divisors (1).

91347887 is an equidigital number, since it uses as much as digits as its factorization.

91347887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 91347887 is about 9557.6088536830. The cubic root of 91347887 is about 450.3665934538.

The spelling of 91347887 in words is "ninety-one million, three hundred forty-seven thousand, eight hundred eighty-seven".