3199820681 has 2 divisors, whose sum is σ = 3199820682. Its totient is φ = 3199820680.

The previous prime is 3199820671. The next prime is 3199820759. The reversal of 3199820681 is 1860289913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3193267081 + 6553600 = 56509^2 + 2560^2 .

It is an emirp because it is prime and its reverse (1860289913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3199820681 - 2¹⁰ = 3199819657 is a prime.

It is a super-2 number, since 2×3199820681² = 20477704781110607522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3199820621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1599910340 + 1599910341.

It is an arithmetic number, because the mean of its divisors is an integer number (1599910341).

Almost surely, 2^3199820681 is an apocalyptic number.

It is an amenable number.

3199820681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3199820681 is an equidigital number, since it uses as much as digits as its factorization.

3199820681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 3199820681 is about 56566.9575017077. The cubic root of 3199820681 is about 1473.5850732401.

The spelling of 3199820681 in words is "three billion, one hundred ninety-nine million, eight hundred twenty thousand, six hundred eighty-one".