6997181 has 8 divisors (see below), whose sum is σ = 7222584. Its totient is φ = 6773760.

The previous prime is 6997171. The next prime is 6997201. The reversal of 6997181 is 1817996.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2374681 + 4622500 = 1541^2 + 2150^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6997181 - 2⁶ = 6997117 is a prime.

It is a super-2 number, since 2×6997181² = 97921083893522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6997171) 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 7 ways as a sum of consecutive naturals, for example, 10061 + ... + 10733.

It is an arithmetic number, because the mean of its divisors is an integer number (902823).

Almost surely, 2^6997181 is an apocalyptic number.

It is an amenable number.

6997181 is a deficient number, since it is larger than the sum of its proper divisors (225403).

6997181 is a wasteful number, since it uses less digits than its factorization.

6997181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

The product of its digits is 27216, while the sum is 41.

The square root of 6997181 is about 2645.2185164935. The cubic root of 6997181 is about 191.2674360056.

The spelling of 6997181 in words is "six million, nine hundred ninety-seven thousand, one hundred eighty-one".