91347643 has 4 divisors (see below), whose sum is σ = 91366960. Its totient is φ = 91328328.

The previous prime is 91347637. The next prime is 91347653. The reversal of 91347643 is 34674319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91347643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91347653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2746 + ... + 13792.

It is an arithmetic number, because the mean of its divisors is an integer number (22841740).

Almost surely, 2^91347643 is an apocalyptic number.

91347643 is a deficient number, since it is larger than the sum of its proper divisors (19317).

91347643 is a wasteful number, since it uses less digits than its factorization.

91347643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19316.

The product of its digits is 54432, while the sum is 37.

The square root of 91347643 is about 9557.5960889755. The cubic root of 91347643 is about 450.3661924610.

The spelling of 91347643 in words is "ninety-one million, three hundred forty-seven thousand, six hundred forty-three".