91684393 has 4 divisors (see below), whose sum is σ = 92164608. Its totient is φ = 91204180.

The previous prime is 91684387. The next prime is 91684421. The reversal of 91684393 is 39348619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91684393 - 2⁹ = 91683881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91684363) 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, 239821 + ... + 240202.

It is an arithmetic number, because the mean of its divisors is an integer number (23041152).

Almost surely, 2^91684393 is an apocalyptic number.

It is an amenable number.

91684393 is a deficient number, since it is larger than the sum of its proper divisors (480215).

91684393 is a wasteful number, since it uses less digits than its factorization.

91684393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480214.

The product of its digits is 139968, while the sum is 43.

The square root of 91684393 is about 9575.1967603804. The cubic root of 91684393 is about 450.9189337138.

The spelling of 91684393 in words is "ninety-one million, six hundred eighty-four thousand, three hundred ninety-three".