3941521 has 4 divisors (see below), whose sum is σ = 3946212. Its totient is φ = 3936832.

The previous prime is 3941507. The next prime is 3941537. The reversal of 3941521 is 1251493.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1251493 = 67 ⋅18679.

It can be written as a sum of positive squares in 2 ways, for example, as 1185921 + 2755600 = 1089^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 3941521 - 2¹¹ = 3939473 is a prime.

It is a Duffinian number.

3941521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3941551) 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, 700 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (986553).

Almost surely, 2^3941521 is an apocalyptic number.

It is an amenable number.

3941521 is a deficient number, since it is larger than the sum of its proper divisors (4691).

3941521 is a wasteful number, since it uses less digits than its factorization.

3941521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4690.

The product of its digits is 1080, while the sum is 25.

The square root of 3941521 is about 1985.3264215237. The cubic root of 3941521 is about 157.9627242087.

The spelling of 3941521 in words is "three million, nine hundred forty-one thousand, five hundred twenty-one".