3821591 has 4 divisors (see below), whose sum is σ = 3953400. Its totient is φ = 3689784.

The previous prime is 3821581. The next prime is 3821627. The reversal of 3821591 is 1951283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1951283 = 419 ⋅4657.

It is a cyclic number.

It is not a de Polignac number, because 3821591 - 2¹⁰ = 3820567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 131779 = 3821591 / (3 + 8 + 2 + 1 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821581) 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, 65861 + ... + 65918.

It is an arithmetic number, because the mean of its divisors is an integer number (988350).

Almost surely, 2^3821591 is an apocalyptic number.

3821591 is a deficient number, since it is larger than the sum of its proper divisors (131809).

3821591 is a wasteful number, since it uses less digits than its factorization.

3821591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131808.

The product of its digits is 2160, while the sum is 29.

The square root of 3821591 is about 1954.8889994064. Note that the first 3 decimals coincide. The cubic root of 3821591 is about 156.3440658124.

The spelling of 3821591 in words is "three million, eight hundred twenty-one thousand, five hundred ninety-one".