3871531 has 4 divisors (see below), whose sum is σ = 3953952. Its totient is φ = 3789112.

The previous prime is 3871523. The next prime is 3871537. The reversal of 3871531 is 1351783.

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 3871531 - 2³ = 3871523 is a prime.

It is a super-2 number, since 2×3871531² = 29977504567922, which contains 22 as substring.

It is a Duffinian number.

3871531 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3871531.

It is not an unprimeable number, because it can be changed into a prime (3871537) 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, 41140 + ... + 41233.

It is an arithmetic number, because the mean of its divisors is an integer number (988488).

Almost surely, 2^3871531 is an apocalyptic number.

3871531 is a deficient number, since it is larger than the sum of its proper divisors (82421).

3871531 is an equidigital number, since it uses as much as digits as its factorization.

3871531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82420.

The product of its digits is 2520, while the sum is 28.

The square root of 3871531 is about 1967.6206443316. The cubic root of 3871531 is about 157.0221478755.

The spelling of 3871531 in words is "three million, eight hundred seventy-one thousand, five hundred thirty-one".