7312891 has 4 divisors (see below), whose sum is σ = 7697800. Its totient is φ = 6927984.

The previous prime is 7312867. The next prime is 7312909. The reversal of 7312891 is 1982137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1982137 = 19 ⋅104323.

It is a cyclic number.

It is not a de Polignac number, because 7312891 - 2⁵ = 7312859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7312831) 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, 192426 + ... + 192463.

It is an arithmetic number, because the mean of its divisors is an integer number (1924450).

Almost surely, 2^7312891 is an apocalyptic number.

7312891 is a deficient number, since it is larger than the sum of its proper divisors (384909).

7312891 is a wasteful number, since it uses less digits than its factorization.

7312891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384908.

The product of its digits is 3024, while the sum is 31.

The square root of 7312891 is about 2704.2357515572. The cubic root of 7312891 is about 194.1018613408.

The spelling of 7312891 in words is "seven million, three hundred twelve thousand, eight hundred ninety-one".