3591421 has 4 divisors (see below), whose sum is σ = 3595644. Its totient is φ = 3587200.

The previous prime is 3591397. The next prime is 3591449. The reversal of 3591421 is 1241953.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1241953 = 31 ⋅40063.

It can be written as a sum of positive squares in 2 ways, for example, as 3422500 + 168921 = 1850^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 3591421 - 2¹¹ = 3589373 is a prime.

It is a Duffinian number.

3591421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3591451) 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, 340 + ... + 2701.

It is an arithmetic number, because the mean of its divisors is an integer number (898911).

Almost surely, 2^3591421 is an apocalyptic number.

It is an amenable number.

3591421 is a deficient number, since it is larger than the sum of its proper divisors (4223).

3591421 is a wasteful number, since it uses less digits than its factorization.

3591421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222.

The product of its digits is 1080, while the sum is 25.

The square root of 3591421 is about 1895.1044826078. The cubic root of 3591421 is about 153.1400457797.

The spelling of 3591421 in words is "three million, five hundred ninety-one thousand, four hundred twenty-one".