3591221 has 4 divisors (see below), whose sum is σ = 3611244. Its totient is φ = 3571200.

The previous prime is 3591193. The next prime is 3591281. The reversal of 3591221 is 1221953.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221953 = 47 ⋅25999.

It can be written as a sum of positive squares in 2 ways, for example, as 34225 + 3556996 = 185^2 + 1886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3591221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3591281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9740 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (902811).

Almost surely, 2^3591221 is an apocalyptic number.

It is an amenable number.

3591221 is a deficient number, since it is larger than the sum of its proper divisors (20023).

3591221 is a wasteful number, since it uses less digits than its factorization.

3591221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20022.

The product of its digits is 540, while the sum is 23.

The square root of 3591221 is about 1895.0517143339. The cubic root of 3591221 is about 153.1372030258.

The spelling of 3591221 in words is "three million, five hundred ninety-one thousand, two hundred twenty-one".