91319673 has 4 divisors (see below), whose sum is σ = 121759568. Its totient is φ = 60879780.

The previous prime is 91319653. The next prime is 91319677. The reversal of 91319673 is 37691319.

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 91319673 - 2⁹ = 91319161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91319677) 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, 15219943 + ... + 15219948.

It is an arithmetic number, because the mean of its divisors is an integer number (30439892).

Almost surely, 2^91319673 is an apocalyptic number.

It is an amenable number.

91319673 is a deficient number, since it is larger than the sum of its proper divisors (30439895).

91319673 is a wasteful number, since it uses less digits than its factorization.

91319673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30439894.

The product of its digits is 30618, while the sum is 39.

The square root of 91319673 is about 9556.1327429039. The cubic root of 91319673 is about 450.3202214580.

The spelling of 91319673 in words is "ninety-one million, three hundred nineteen thousand, six hundred seventy-three".