3537221 has 4 divisors (see below), whose sum is σ = 3546444. Its totient is φ = 3528000.

The previous prime is 3537199. The next prime is 3537269. The reversal of 3537221 is 1227353.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3062500 + 474721 = 1750^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 3537221 - 2¹⁴ = 3520837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3537271) 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 in 3 ways as a sum of consecutive naturals, for example, 4010 + ... + 4811.

It is an arithmetic number, because the mean of its divisors is an integer number (886611).

Almost surely, 2^3537221 is an apocalyptic number.

It is an amenable number.

3537221 is a deficient number, since it is larger than the sum of its proper divisors (9223).

3537221 is an equidigital number, since it uses as much as digits as its factorization.

3537221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222.

The product of its digits is 1260, while the sum is 23.

The square root of 3537221 is about 1880.7501163100. The cubic root of 3537221 is about 152.3657656011.

The spelling of 3537221 in words is "three million, five hundred thirty-seven thousand, two hundred twenty-one".