3197981 has 4 divisors (see below), whose sum is σ = 3202332. Its totient is φ = 3193632.

The previous prime is 3197939. The next prime is 3197983. The reversal of 3197981 is 1897913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1897913 = 31 ⋅61223.

It can be written as a sum of positive squares in 2 ways, for example, as 1585081 + 1612900 = 1259^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 3197981 - 2¹⁰ = 3196957 is a prime.

It is a super-2 number, since 2×3197981² = 20454164952722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3197983) 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, 770 + ... + 2643.

It is an arithmetic number, because the mean of its divisors is an integer number (800583).

Almost surely, 2^3197981 is an apocalyptic number.

It is an amenable number.

3197981 is a deficient number, since it is larger than the sum of its proper divisors (4351).

3197981 is an equidigital number, since it uses as much as digits as its factorization.

3197981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350.

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

The square root of 3197981 is about 1788.2899653020. The cubic root of 3197981 is about 147.3302615104.

The spelling of 3197981 in words is "three million, one hundred ninety-seven thousand, nine hundred eighty-one".