3513821 has 2 divisors, whose sum is σ = 3513822. Its totient is φ = 3513820.

The previous prime is 3513799. The next prime is 3513859. The reversal of 3513821 is 1283153.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2856100 + 657721 = 1690^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 3513821 - 2¹⁰ = 3512797 is a prime.

It is a Chen prime.

It is equal to p₂₅₁₀₆₉ and since 3513821 and 251069 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3513121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1756910 + 1756911.

It is an arithmetic number, because the mean of its divisors is an integer number (1756911).

Almost surely, 2^3513821 is an apocalyptic number.

It is an amenable number.

3513821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3513821 is an equidigital number, since it uses as much as digits as its factorization.

3513821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 3513821 is about 1874.5188716041. The cubic root of 3513821 is about 152.0290370426.

Adding to 3513821 its reverse (1283153), we get a palindrome (4796974).

It can be divided in two parts, 3513 and 821, that added together give a palindrome (4334).

The spelling of 3513821 in words is "three million, five hundred thirteen thousand, eight hundred twenty-one".