3891131 has 2 divisors, whose sum is σ = 3891132. Its totient is φ = 3891130.

The previous prime is 3891103. The next prime is 3891137. The reversal of 3891131 is 1311983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3891131 - 2¹⁴ = 3874747 is a prime.

It is a super-2 number, since 2×3891131² = 30281800918322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3891131.

It is not a weakly prime, because it can be changed into another prime (3891137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945565 + 1945566.

It is an arithmetic number, because the mean of its divisors is an integer number (1945566).

Almost surely, 2^3891131 is an apocalyptic number.

3891131 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891131 is an equidigital number, since it uses as much as digits as its factorization.

3891131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

The square root of 3891131 is about 1972.5949913756. The cubic root of 3891131 is about 157.2866819018.

The spelling of 3891131 in words is "three million, eight hundred ninety-one thousand, one hundred thirty-one".