6991313 has 4 divisors (see below), whose sum is σ = 7990080. Its totient is φ = 5992548.

The previous prime is 6991289. The next prime is 6991319. The reversal of 6991313 is 3131996.

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 a cyclic number.

It is not a de Polignac number, because 6991313 - 2¹⁰ = 6990289 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6991313.

It is not an unprimeable number, because it can be changed into a prime (6991319) 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, 499373 + ... + 499386.

It is an arithmetic number, because the mean of its divisors is an integer number (1997520).

Almost surely, 2^6991313 is an apocalyptic number.

It is an amenable number.

6991313 is a deficient number, since it is larger than the sum of its proper divisors (998767).

6991313 is an equidigital number, since it uses as much as digits as its factorization.

6991313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998766.

The product of its digits is 4374, while the sum is 32.

The square root of 6991313 is about 2644.1091127259. The cubic root of 6991313 is about 191.2139539340.

The spelling of 6991313 in words is "six million, nine hundred ninety-one thousand, three hundred thirteen".