3891571 has 2 divisors, whose sum is σ = 3891572. Its totient is φ = 3891570.

The previous prime is 3891551. The next prime is 3891593. The reversal of 3891571 is 1751983.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3891571 - 2¹³ = 3883379 is a prime.

It is not a weakly prime, because it can be changed into another prime (3891541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945785 + 1945786.

It is an arithmetic number, because the mean of its divisors is an integer number (1945786).

Almost surely, 2^3891571 is an apocalyptic number.

3891571 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891571 is an equidigital number, since it uses as much as digits as its factorization.

3891571 is an odious number, because the sum of its binary digits is odd.

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

The square root of 3891571 is about 1972.7065164388. The cubic root of 3891571 is about 157.2926102151.

The spelling of 3891571 in words is "three million, eight hundred ninety-one thousand, five hundred seventy-one".