3198140081 has 4 divisors (see below), whose sum is σ = 3198544500. Its totient is φ = 3197735664.

The previous prime is 3198140069. The next prime is 3198140089. The reversal of 3198140081 is 1800418913.

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 38688400 + 3159451681 = 6220^2 + 56209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3198140081 is a prime.

It is a super-2 number, since 2×3198140081² = 20456199955397373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3198140089) 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, 190106 + ... + 206243.

It is an arithmetic number, because the mean of its divisors is an integer number (799636125).

Almost surely, 2^3198140081 is an apocalyptic number.

It is an amenable number.

3198140081 is a deficient number, since it is larger than the sum of its proper divisors (404419).

3198140081 is an equidigital number, since it uses as much as digits as its factorization.

3198140081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404418.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 3198140081 is about 56552.1005887491. The cubic root of 3198140081 is about 1473.3270441175.

Adding to 3198140081 its reverse (1800418913), we get a palindrome (4998558994).

The spelling of 3198140081 in words is "three billion, one hundred ninety-eight million, one hundred forty thousand, eighty-one".