91321443331 has 4 divisors (see below), whose sum is σ = 92174914872. Its totient is φ = 90467971792.

The previous prime is 91321443287. The next prime is 91321443349. The reversal of 91321443331 is 13334412319.

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

It is a cyclic number.

It is not a de Polignac number, because 91321443331 - 2⁷ = 91321443203 is a prime.

It is a super-2 number, since 2×91321443331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91321443361) 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, 426735610 + ... + 426735823.

It is an arithmetic number, because the mean of its divisors is an integer number (23043728718).

Almost surely, 2^91321443331 is an apocalyptic number.

91321443331 is a deficient number, since it is larger than the sum of its proper divisors (853471541).

91321443331 is a wasteful number, since it uses less digits than its factorization.

91321443331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853471540.

The product of its digits is 23328, while the sum is 34.

The spelling of 91321443331 in words is "ninety-one billion, three hundred twenty-one million, four hundred forty-three thousand, three hundred thirty-one".