3643121 has 4 divisors (see below), whose sum is σ = 3661812. Its totient is φ = 3624432.

The previous prime is 3643099. The next prime is 3643127. The reversal of 3643121 is 1213463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1213463 = 541 ⋅2243.

It can be written as a sum of positive squares in 2 ways, for example, as 2768896 + 874225 = 1664^2 + 935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3643121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3643093 and 3643102.

It is not an unprimeable number, because it can be changed into a prime (3643127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9050 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (915453).

Almost surely, 2^3643121 is an apocalyptic number.

It is an amenable number.

3643121 is a deficient number, since it is larger than the sum of its proper divisors (18691).

3643121 is a wasteful number, since it uses less digits than its factorization.

3643121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18690.

The product of its digits is 432, while the sum is 20.

The square root of 3643121 is about 1908.6961518272. The cubic root of 3643121 is about 153.8713858423.

Adding to 3643121 its reverse (1213463), we get a palindrome (4856584).

The spelling of 3643121 in words is "three million, six hundred forty-three thousand, one hundred twenty-one".