3981571 has 4 divisors (see below), whose sum is σ = 4343544. Its totient is φ = 3619600.

The previous prime is 3981569. The next prime is 3981581. The reversal of 3981571 is 1751893.

It is a happy number.

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 3981571 - 2¹ = 3981569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981541) 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, 180970 + ... + 180991.

It is an arithmetic number, because the mean of its divisors is an integer number (1085886).

Almost surely, 2^3981571 is an apocalyptic number.

3981571 is a deficient number, since it is larger than the sum of its proper divisors (361973).

3981571 is a wasteful number, since it uses less digits than its factorization.

3981571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361972.

The product of its digits is 7560, while the sum is 34.

The square root of 3981571 is about 1995.3874310519. The cubic root of 3981571 is about 158.4959447260.

The spelling of 3981571 in words is "three million, nine hundred eighty-one thousand, five hundred seventy-one".