3197810981 has 4 divisors (see below), whose sum is σ = 3197925612. Its totient is φ = 3197696352.

The previous prime is 3197810963. The next prime is 3197810999. The reversal of 3197810981 is 1890187913.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (3197810963) and next prime (3197810999).

It can be written as a sum of positive squares in 2 ways, for example, as 1619338081 + 1578472900 = 40241^2 + 39730^2 .

It is a cyclic number.

It is not a de Polignac number, because 3197810981 - 2¹⁰ = 3197809957 is a prime.

It is a super-2 number, since 2×3197810981² = 20451990140408364722, 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 (3197710981) 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, 14651 + ... + 81303.

It is an arithmetic number, because the mean of its divisors is an integer number (799481403).

Almost surely, 2^3197810981 is an apocalyptic number.

It is an amenable number.

3197810981 is a deficient number, since it is larger than the sum of its proper divisors (114631).

3197810981 is an equidigital number, since it uses as much as digits as its factorization.

3197810981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114630.

The product of its (nonzero) digits is 108864, while the sum is 47.

The square root of 3197810981 is about 56549.1908076499. The cubic root of 3197810981 is about 1473.2765055180.

The spelling of 3197810981 in words is "three billion, one hundred ninety-seven million, eight hundred ten thousand, nine hundred eighty-one".