91319331 has 4 divisors (see below), whose sum is σ = 121759112. Its totient is φ = 60879552.

The previous prime is 91319303. The next prime is 91319351. The reversal of 91319331 is 13391319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13391319 = 3 ⋅4463773.

It is a de Polignac number, because none of the positive numbers 2^k-91319331 is a prime.

It is a super-2 number, since 2×91319331² = 16678440428575122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91319351) 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 3 ways as a sum of consecutive naturals, for example, 15219886 + ... + 15219891.

It is an arithmetic number, because the mean of its divisors is an integer number (30439778).

Almost surely, 2^91319331 is an apocalyptic number.

91319331 is a deficient number, since it is larger than the sum of its proper divisors (30439781).

91319331 is a wasteful number, since it uses less digits than its factorization.

91319331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30439780.

The product of its digits is 2187, while the sum is 30.

The square root of 91319331 is about 9556.1148486192. The cubic root of 91319331 is about 450.3196592947.

The spelling of 91319331 in words is "ninety-one million, three hundred nineteen thousand, three hundred thirty-one".