3197988865 has 4 divisors (see below), whose sum is σ = 3837586644. Its totient is φ = 2558391088.

The previous prime is 3197988863. The next prime is 3197988877. The reversal of 3197988865 is 5688897913.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1554172929 + 1643815936 = 39423^2 + 40544^2 .

It is a cyclic number.

It is not a de Polignac number, because 3197988865 - 2¹ = 3197988863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3197988797 and 3197988806.

It is not an unprimeable number, because it can be changed into a prime (3197988863) 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, 319798882 + ... + 319798891.

It is an arithmetic number, because the mean of its divisors is an integer number (959396661).

Almost surely, 2^3197988865 is an apocalyptic number.

It is an amenable number.

3197988865 is a deficient number, since it is larger than the sum of its proper divisors (639597779).

3197988865 is an equidigital number, since it uses as much as digits as its factorization.

3197988865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639597778.

The product of its digits is 26127360, while the sum is 64.

The square root of 3197988865 is about 56550.7636111132. The cubic root of 3197988865 is about 1473.3038228985.

The spelling of 3197988865 in words is "three billion, one hundred ninety-seven million, nine hundred eighty-eight thousand, eight hundred sixty-five".