3921571 has 4 divisors (see below), whose sum is σ = 3928072. Its totient is φ = 3915072.

The previous prime is 3921559. The next prime is 3921601. The reversal of 3921571 is 1751293.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3921571 - 2⁹ = 3921059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921521) 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, 2241 + ... + 3586.

It is an arithmetic number, because the mean of its divisors is an integer number (982018).

Almost surely, 2^3921571 is an apocalyptic number.

3921571 is a deficient number, since it is larger than the sum of its proper divisors (6501).

3921571 is an equidigital number, since it uses as much as digits as its factorization.

3921571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500.

The product of its digits is 1890, while the sum is 28.

The square root of 3921571 is about 1980.2956849925. The cubic root of 3921571 is about 157.6957639658.

The spelling of 3921571 in words is "three million, nine hundred twenty-one thousand, five hundred seventy-one".