3643 has 2 divisors, whose sum is σ = 3644. Its totient is φ = 3642.
The previous prime is 3637. The next prime is 3659. The reversal of 3643 is 3463.
It is a happy number.
It is an a-pointer prime, because the next prime (3659) can be obtained adding 3643 to its sum of digits (16).
It is a weak prime.
3643 is a truncatable prime.
It is an emirp because it is prime and its reverse (3463) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-3643 is a prime.
It is a plaindrome in base 15.
It is not a weakly prime, because it can be changed into another prime (3613) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821 + 1822.
It is an arithmetic number, because the mean of its divisors is an integer number (1822).
3643 is a deficient number, since it is larger than the sum of its proper divisors (1).
3643 is an equidigital number, since it uses as much as digits as its factorization.
3643 is an evil number, because the sum of its binary digits is even.
The product of its digits is 216, while the sum is 16.
The square root of 3643 is about 60.3572696533. The cubic root of 3643 is about 15.3869682299.
It can be divided in two parts, 3 and 643, that added together give a palindrome (646).
The spelling of 3643 in words is "three thousand, six hundred forty-three".
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