3524821 has 2 divisors, whose sum is σ = 3524822. Its totient is φ = 3524820.

The previous prime is 3524789. The next prime is 3524827. The reversal of 3524821 is 1284253.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2907025 + 617796 = 1705^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 3524821 - 2⁵ = 3524789 is a prime.

3524821 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3524827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1762410 + 1762411.

It is an arithmetic number, because the mean of its divisors is an integer number (1762411).

Almost surely, 2^3524821 is an apocalyptic number.

It is an amenable number.

3524821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3524821 is an equidigital number, since it uses as much as digits as its factorization.

3524821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 3524821 is about 1877.4506651308. The cubic root of 3524821 is about 152.1875138474.

The spelling of 3524821 in words is "three million, five hundred twenty-four thousand, eight hundred twenty-one".