3664681 has 2 divisors, whose sum is σ = 3664682. Its totient is φ = 3664680.

The previous prime is 3664679. The next prime is 3664691. The reversal of 3664681 is 1864663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2509056 + 1155625 = 1584^2 + 1075^2 .

It is a cyclic number.

It is not a de Polignac number, because 3664681 - 2¹ = 3664679 is a prime.

It is a super-4 number, since 4×3664681⁴ (a number of 27 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 3664679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3664631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832340 + 1832341.

It is an arithmetic number, because the mean of its divisors is an integer number (1832341).

Almost surely, 2^3664681 is an apocalyptic number.

It is an amenable number.

3664681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3664681 is an equidigital number, since it uses as much as digits as its factorization.

3664681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 3664681 is about 1914.3356549989. The cubic root of 3664681 is about 154.1743261189.

The spelling of 3664681 in words is "three million, six hundred sixty-four thousand, six hundred eighty-one".