6856919 has 2 divisors, whose sum is σ = 6856920. Its totient is φ = 6856918.

The previous prime is 6856901. The next prime is 6856931. The reversal of 6856919 is 9196586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6856919 - 2¹² = 6852823 is a prime.

It is a super-2 number, since 2×6856919² = 94034676345122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6856919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6856999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428459 + 3428460.

It is an arithmetic number, because the mean of its divisors is an integer number (3428460).

Almost surely, 2^6856919 is an apocalyptic number.

6856919 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856919 is an equidigital number, since it uses as much as digits as its factorization.

6856919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 6856919 is about 2618.5719390538. The cubic root of 6856919 is about 189.9807829133.

The spelling of 6856919 in words is "six million, eight hundred fifty-six thousand, nine hundred nineteen".