3181997 has 16 divisors (see below), whose sum is σ = 3978240. Its totient is φ = 2477952.

The previous prime is 3181973. The next prime is 3181999. The reversal of 3181997 is 7991813.

3181997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3181997 - 2¹² = 3177901 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3181997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3181999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6404 + ... + 6882.

It is an arithmetic number, because the mean of its divisors is an integer number (248640).

Almost surely, 2^3181997 is an apocalyptic number.

It is an amenable number.

3181997 is a deficient number, since it is larger than the sum of its proper divisors (796243).

3181997 is a wasteful number, since it uses less digits than its factorization.

3181997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572.

The product of its digits is 13608, while the sum is 38.

The square root of 3181997 is about 1783.8152931287. The cubic root of 3181997 is about 147.0843916673.

It can be divided in two parts, 31 and 81997, that added together give a palindrome (82028).

The spelling of 3181997 in words is "three million, one hundred eighty-one thousand, nine hundred ninety-seven".