3640121 has 2 divisors, whose sum is σ = 3640122. Its totient is φ = 3640120.

The previous prime is 3640081. The next prime is 3640151. The reversal of 3640121 is 1210463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2941225 + 698896 = 1715^2 + 836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3640121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3640121.

It is not a weakly prime, because it can be changed into another prime (3640151) 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, 1820060 + 1820061.

It is an arithmetic number, because the mean of its divisors is an integer number (1820061).

Almost surely, 2^3640121 is an apocalyptic number.

It is an amenable number.

3640121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640121 is an equidigital number, since it uses as much as digits as its factorization.

3640121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3640121 is about 1907.9101131867. The cubic root of 3640121 is about 153.8291380989.

Adding to 3640121 its reverse (1210463), we get a palindrome (4850584).

The spelling of 3640121 in words is "three million, six hundred forty thousand, one hundred twenty-one".