3613681 has 2 divisors, whose sum is σ = 3613682. Its totient is φ = 3613680.

The previous prime is 3613663. The next prime is 3613693. The reversal of 3613681 is 1863163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2073600 + 1540081 = 1440^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 3613681 - 2¹³ = 3605489 is a prime.

It is a super-2 number, since 2×3613681² = 26117380739522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3613601) 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 as a sum of consecutive naturals, namely, 1806840 + 1806841.

It is an arithmetic number, because the mean of its divisors is an integer number (1806841).

Almost surely, 2^3613681 is an apocalyptic number.

It is an amenable number.

3613681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3613681 is an equidigital number, since it uses as much as digits as its factorization.

3613681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 3613681 is about 1900.9684374024. The cubic root of 3613681 is about 153.4557869743.

The spelling of 3613681 in words is "three million, six hundred thirteen thousand, six hundred eighty-one".