6851979 has 8 divisors (see below), whose sum is σ = 10151120. Its totient is φ = 4567968.

The previous prime is 6851963. The next prime is 6851987. The reversal of 6851979 is 9791586.

Added to its reverse (9791586) it gives a triangular number (16643565 = T₅₇₆₉).

6851979 is a `hidden beast` number, since 68 + 519 + 79 = 666.

It is not a de Polignac number, because 6851979 - 2⁴ = 6851963 is a prime.

It is a Duffinian number.

6851979 is a lucky number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (6851479) 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 in 7 ways as a sum of consecutive naturals, for example, 126862 + ... + 126915.

It is an arithmetic number, because the mean of its divisors is an integer number (1268890).

Almost surely, 2^6851979 is an apocalyptic number.

6851979 is a deficient number, since it is larger than the sum of its proper divisors (3299141).

6851979 is a wasteful number, since it uses less digits than its factorization.

6851979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253786 (or 253780 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 6851979 is about 2617.6285068741. The cubic root of 6851979 is about 189.9351486891.

Adding to 6851979 its reverse (9791586), we get a triangular number (16643565 = T₅₇₆₉).

The spelling of 6851979 in words is "six million, eight hundred fifty-one thousand, nine hundred seventy-nine".