3871831 has 2 divisors, whose sum is σ = 3871832. Its totient is φ = 3871830.

The previous prime is 3871823. The next prime is 3871841. The reversal of 3871831 is 1381783.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3871831 - 2³ = 3871823 is a prime.

It is a super-2 number, since 2×3871831² = 29982150585122, which contains 22 as substring.

It is equal to p₂₇₄₇₃₈ and since 3871831 and 274738 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 3871793 and 3871802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3871811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1935915 + 1935916.

It is an arithmetic number, because the mean of its divisors is an integer number (1935916).

Almost surely, 2^3871831 is an apocalyptic number.

3871831 is a deficient number, since it is larger than the sum of its proper divisors (1).

3871831 is an equidigital number, since it uses as much as digits as its factorization.

3871831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 3871831 is about 1967.6968770621. The cubic root of 3871831 is about 157.0262035861.

The spelling of 3871831 in words is "three million, eight hundred seventy-one thousand, eight hundred thirty-one".