6531191 has 2 divisors, whose sum is σ = 6531192. Its totient is φ = 6531190.

The previous prime is 6531181. The next prime is 6531199. The reversal of 6531191 is 1911356.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6531191 - 2¹⁸ = 6269047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6531191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531199) 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, 3265595 + 3265596.

It is an arithmetic number, because the mean of its divisors is an integer number (3265596).

Almost surely, 2^6531191 is an apocalyptic number.

6531191 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531191 is an equidigital number, since it uses as much as digits as its factorization.

6531191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 26.

The square root of 6531191 is about 2555.6194943692. The cubic root of 6531191 is about 186.9235963816.

It can be divided in two parts, 6531 and 191, that multiplied together give a palindrome (1247421).

The spelling of 6531191 in words is "six million, five hundred thirty-one thousand, one hundred ninety-one".