3520813 has 2 divisors, whose sum is σ = 3520814. Its totient is φ = 3520812.

The previous prime is 3520801. The next prime is 3520837. The reversal of 3520813 is 3180253.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2350089 + 1170724 = 1533^2 + 1082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3520813 is a prime.

It is a super-3 number, since 3×3520813³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3520873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760406 + 1760407.

It is an arithmetic number, because the mean of its divisors is an integer number (1760407).

Almost surely, 2^3520813 is an apocalyptic number.

It is an amenable number.

3520813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3520813 is an equidigital number, since it uses as much as digits as its factorization.

3520813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 3520813 is about 1876.3829566482. The cubic root of 3520813 is about 152.1298088939.

The spelling of 3520813 in words is "three million, five hundred twenty thousand, eight hundred thirteen".