6997309 has 6 divisors (see below), whose sum is σ = 7691390. Its totient is φ = 6361080.

The previous prime is 6997307. The next prime is 6997321. The reversal of 6997309 is 9037996.

It can be written as a sum of positive squares in only one way, i.e., 6017209 + 980100 = 2453^2 + 990^2 .

It is not a de Polignac number, because 6997309 - 2¹ = 6997307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6997303) 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 5 ways as a sum of consecutive naturals, for example, 28794 + ... + 29035.

Almost surely, 2^6997309 is an apocalyptic number.

It is an amenable number.

6997309 is a deficient number, since it is larger than the sum of its proper divisors (694081).

6997309 is a wasteful number, since it uses less digits than its factorization.

6997309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57851 (or 57840 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 6997309 is about 2645.2427109814. The cubic root of 6997309 is about 191.2686022887.

It can be divided in two parts, 699 and 7309, that added together give a palindrome (8008).

The spelling of 6997309 in words is "six million, nine hundred ninety-seven thousand, three hundred nine".