3271991 has 2 divisors, whose sum is σ = 3271992. Its totient is φ = 3271990.

The previous prime is 3271981. The next prime is 3271993. The reversal of 3271991 is 1991723.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1991723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3271991 - 2⁶ = 3271927 is a prime.

Together with 3271993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3271993) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1635995 + 1635996.

It is an arithmetic number, because the mean of its divisors is an integer number (1635996).

Almost surely, 2^3271991 is an apocalyptic number.

3271991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3271991 is an equidigital number, since it uses as much as digits as its factorization.

3271991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 32.

The square root of 3271991 is about 1808.8645609885. The cubic root of 3271991 is about 148.4581462916.

The spelling of 3271991 in words is "three million, two hundred seventy-one thousand, nine hundred ninety-one".