3209681 has 2 divisors, whose sum is σ = 3209682. Its totient is φ = 3209680.

The previous prime is 3209653. The next prime is 3209683. The reversal of 3209681 is 1869023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3094081 + 115600 = 1759^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 3209681 - 2¹⁰ = 3208657 is a prime.

It is a super-2 number, since 2×3209681² = 20604104243522, which contains 22 as substring.

Together with 3209683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3209683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1604840 + 1604841.

It is an arithmetic number, because the mean of its divisors is an integer number (1604841).

Almost surely, 2^3209681 is an apocalyptic number.

It is an amenable number.

3209681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3209681 is an equidigital number, since it uses as much as digits as its factorization.

3209681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 3209681 is about 1791.5582602863. The cubic root of 3209681 is about 147.5097149591.

It can be divided in two parts, 320 and 9681, that added together give a palindrome (10001).

The spelling of 3209681 in words is "three million, two hundred nine thousand, six hundred eighty-one".