91684397 has 4 divisors (see below), whose sum is σ = 104782176. Its totient is φ = 78586620.

The previous prime is 91684387. The next prime is 91684421. The reversal of 91684397 is 79348619.

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 not a de Polignac number, because 91684397 - 2⁴ = 91684381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91684387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6548879 + ... + 6548892.

It is an arithmetic number, because the mean of its divisors is an integer number (26195544).

Almost surely, 2^91684397 is an apocalyptic number.

It is an amenable number.

91684397 is a deficient number, since it is larger than the sum of its proper divisors (13097779).

91684397 is a wasteful number, since it uses less digits than its factorization.

91684397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13097778.

The product of its digits is 326592, while the sum is 47.

The square root of 91684397 is about 9575.1969692534. The cubic root of 91684397 is about 450.9189402714.

The spelling of 91684397 in words is "ninety-one million, six hundred eighty-four thousand, three hundred ninety-seven".