3639281 has 2 divisors, whose sum is σ = 3639282. Its totient is φ = 3639280.

The previous prime is 3639277. The next prime is 3639287. The reversal of 3639281 is 1829363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3389281 + 250000 = 1841^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639281 - 2² = 3639277 is a prime.

It is a super-2 number, since 2×3639281² = 26488732393922, 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 (3639287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819640 + 1819641.

It is an arithmetic number, because the mean of its divisors is an integer number (1819641).

Almost surely, 2^3639281 is an apocalyptic number.

It is an amenable number.

3639281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639281 is an equidigital number, since it uses as much as digits as its factorization.

3639281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 3639281 is about 1907.6899643286. The cubic root of 3639281 is about 153.8173045713.

The spelling of 3639281 in words is "three million, six hundred thirty-nine thousand, two hundred eighty-one".