3871561 has 8 divisors (see below), whose sum is σ = 3951360. Its totient is φ = 3792768.

The previous prime is 3871547. The next prime is 3871579. The reversal of 3871561 is 1651783.

3871561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3871561 - 2⁷ = 3871433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3871501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16080 + ... + 16318.

It is an arithmetic number, because the mean of its divisors is an integer number (493920).

Almost surely, 2^3871561 is an apocalyptic number.

It is an amenable number.

3871561 is a deficient number, since it is larger than the sum of its proper divisors (79799).

3871561 is a wasteful number, since it uses less digits than its factorization.

3871561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its digits is 5040, while the sum is 31.

The square root of 3871561 is about 1967.6282677376. The cubic root of 3871561 is about 157.0225534560.

The spelling of 3871561 in words is "three million, eight hundred seventy-one thousand, five hundred sixty-one".