3521391 has 8 divisors (see below), whose sum is σ = 4743984. Its totient is φ = 2323200.

The previous prime is 3521389. The next prime is 3521417. The reversal of 3521391 is 1931253.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3521391 - 2¹ = 3521389 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

3521391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5760 + ... + 6341.

It is an arithmetic number, because the mean of its divisors is an integer number (592998).

Almost surely, 2^3521391 is an apocalyptic number.

3521391 is a deficient number, since it is larger than the sum of its proper divisors (1222593).

3521391 is a wasteful number, since it uses less digits than its factorization.

3521391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12201.

The product of its digits is 810, while the sum is 24.

The square root of 3521391 is about 1876.5369700595. The cubic root of 3521391 is about 152.1381333177.

The spelling of 3521391 in words is "three million, five hundred twenty-one thousand, three hundred ninety-one".