3641021 has 4 divisors (see below), whose sum is σ = 3690972. Its totient is φ = 3591072.

The previous prime is 3640999. The next prime is 3641041. The reversal of 3641021 is 1201463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1201463 = 43 ⋅27941.

It can be written as a sum of positive squares in 2 ways, for example, as 835396 + 2805625 = 914^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 3641021 - 2¹⁰ = 3639997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3641041) 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, 24866 + ... + 25011.

It is an arithmetic number, because the mean of its divisors is an integer number (922743).

Almost surely, 2^3641021 is an apocalyptic number.

It is an amenable number.

3641021 is a deficient number, since it is larger than the sum of its proper divisors (49951).

3641021 is an equidigital number, since it uses as much as digits as its factorization.

3641021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49950.

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

The square root of 3641021 is about 1908.1459587778. The cubic root of 3641021 is about 153.8418148584.

Adding to 3641021 its reverse (1201463), we get a palindrome (4842484).

The spelling of 3641021 in words is "three million, six hundred forty-one thousand, twenty-one".