3199981 has 8 divisors (see below), whose sum is σ = 3288600. Its totient is φ = 3112512.

The previous prime is 3199979. The next prime is 3199991. The reversal of 3199981 is 1899913.

It can be written as a sum of positive squares in 4 ways, for example, as 1865956 + 1334025 = 1366^2 + 1155^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3199981 - 2¹ = 3199979 is a prime.

It is a super-2 number, since 2×3199981² = 20479756800722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3199951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8995 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (411075).

Almost surely, 2^3199981 is an apocalyptic number.

It is an amenable number.

3199981 is a deficient number, since it is larger than the sum of its proper divisors (88619).

3199981 is a wasteful number, since it uses less digits than its factorization.

3199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575.

The product of its digits is 17496, while the sum is 40.

The square root of 3199981 is about 1788.8490713305. The cubic root of 3199981 is about 147.3609682925.

The spelling of 3199981 in words is "three million, one hundred ninety-nine thousand, nine hundred eighty-one".