3201391 has 2 divisors, whose sum is σ = 3201392. Its totient is φ = 3201390.

The previous prime is 3201379. The next prime is 3201409. The reversal of 3201391 is 1931023.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3201391 is a prime.

3201391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3201361) 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, 1600695 + 1600696.

It is an arithmetic number, because the mean of its divisors is an integer number (1600696).

Almost surely, 2^3201391 is an apocalyptic number.

3201391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3201391 is an equidigital number, since it uses as much as digits as its factorization.

3201391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 3201391 is about 1789.2431360774. The cubic root of 3201391 is about 147.3826088851.

It can be divided in two parts, 320 and 1391, that added together give a triangular number (1711 = T₅₈).

The spelling of 3201391 in words is "three million, two hundred one thousand, three hundred ninety-one".