3525821 has 4 divisors (see below), whose sum is σ = 3797052. Its totient is φ = 3254592.

The previous prime is 3525803. The next prime is 3525829. The reversal of 3525821 is 1285253.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1285253 = 241 ⋅5333.

It can be written as a sum of positive squares in 2 ways, for example, as 235225 + 3290596 = 485^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 3525821 - 2¹⁴ = 3509437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3525829) 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, 135596 + ... + 135621.

It is an arithmetic number, because the mean of its divisors is an integer number (949263).

Almost surely, 2^3525821 is an apocalyptic number.

It is an amenable number.

3525821 is a deficient number, since it is larger than the sum of its proper divisors (271231).

3525821 is a wasteful number, since it uses less digits than its factorization.

3525821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271230.

The product of its digits is 2400, while the sum is 26.

The square root of 3525821 is about 1877.7169648272. The cubic root of 3525821 is about 152.2019044717.

The spelling of 3525821 in words is "three million, five hundred twenty-five thousand, eight hundred twenty-one".