6951391 has 2 divisors, whose sum is σ = 6951392. Its totient is φ = 6951390.

The previous prime is 6951383. The next prime is 6951403. The reversal of 6951391 is 1931596.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6951391 - 2³ = 6951383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6951341) 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, 3475695 + 3475696.

It is an arithmetic number, because the mean of its divisors is an integer number (3475696).

Almost surely, 2^6951391 is an apocalyptic number.

6951391 is the 1668-th centered pentagonal number.

6951391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6951391 is an equidigital number, since it uses as much as digits as its factorization.

6951391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 34.

The square root of 6951391 is about 2636.5490702811. The cubic root of 6951391 is about 190.8493004613.

It can be divided in two parts, 695 and 1391, that multiplied together give a triangular number (966745 = T₁₃₉₀).

The spelling of 6951391 in words is "six million, nine hundred fifty-one thousand, three hundred ninety-one".