3521381 has 4 divisors (see below), whose sum is σ = 3596352. Its totient is φ = 3446412.

The previous prime is 3521377. The next prime is 3521389. The reversal of 3521381 is 1831253.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3521381 - 2² = 3521377 is a prime.

It is a super-2 number, since 2×3521381² = 24800248294322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521389) 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, 37415 + ... + 37508.

It is an arithmetic number, because the mean of its divisors is an integer number (899088).

Almost surely, 2^3521381 is an apocalyptic number.

It is an amenable number.

3521381 is a deficient number, since it is larger than the sum of its proper divisors (74971).

3521381 is an equidigital number, since it uses as much as digits as its factorization.

3521381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74970.

The product of its digits is 720, while the sum is 23.

The square root of 3521381 is about 1876.5343055750. The cubic root of 3521381 is about 152.1379893042.

The spelling of 3521381 in words is "three million, five hundred twenty-one thousand, three hundred eighty-one".