3521281 has 2 divisors, whose sum is σ = 3521282. Its totient is φ = 3521280.

The previous prime is 3521257. The next prime is 3521291. The reversal of 3521281 is 1821253.

3521281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3207681 + 313600 = 1791^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 3521281 - 2⁵ = 3521249 is a prime.

It is a super-2 number, since 2×3521281² = 24798839761922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3521201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760640 + 1760641.

It is an arithmetic number, because the mean of its divisors is an integer number (1760641).

Almost surely, 2^3521281 is an apocalyptic number.

It is an amenable number.

3521281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3521281 is an equidigital number, since it uses as much as digits as its factorization.

3521281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 3521281 is about 1876.5076605226. The cubic root of 3521281 is about 152.1365491549.

It can be divided in two parts, 35 and 21281, that added together give a square (21316 = 146²).

The spelling of 3521281 in words is "three million, five hundred twenty-one thousand, two hundred eighty-one".