91384993 has 16 divisors (see below), whose sum is σ = 108205056. Its totient is φ = 75525120.

The previous prime is 91384987. The next prime is 91385011. The reversal of 91384993 is 39948319.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91384993 is a prime.

It is a super-2 number, since 2×91384993² = 16702433891220098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91384903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76005 + ... + 77197.

It is an arithmetic number, because the mean of its divisors is an integer number (6762816).

Almost surely, 2^91384993 is an apocalyptic number.

It is an amenable number.

91384993 is a deficient number, since it is larger than the sum of its proper divisors (16820063).

91384993 is a wasteful number, since it uses less digits than its factorization.

91384993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584.

The product of its digits is 209952, while the sum is 46.

The square root of 91384993 is about 9559.5498324973. The cubic root of 91384993 is about 450.4275656381.

The spelling of 91384993 in words is "ninety-one million, three hundred eighty-four thousand, nine hundred ninety-three".