6997997 has 4 divisors (see below), whose sum is σ = 7006176. Its totient is φ = 6989820.

The previous prime is 6997967. The next prime is 6998009. The reversal of 6997997 is 7997996.

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 6997997 - 2¹⁴ = 6981613 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 (6997927) 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, 2633 + ... + 4574.

It is an arithmetic number, because the mean of its divisors is an integer number (1751544).

Almost surely, 2^6997997 is an apocalyptic number.

It is an amenable number.

6997997 is a deficient number, since it is larger than the sum of its proper divisors (8179).

6997997 is an equidigital number, since it uses as much as digits as its factorization.

6997997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8178.

The product of its digits is 1928934, while the sum is 56.

The square root of 6997997 is about 2645.3727525625. The cubic root of 6997997 is about 191.2748708169.

Subtracting 6997997 from its reverse (7997996), we obtain a palindrome (999999).

The spelling of 6997997 in words is "six million, nine hundred ninety-seven thousand, nine hundred ninety-seven".