6918891 has 8 divisors (see below), whose sum is σ = 10543104. Its totient is φ = 3953640.

The previous prime is 6918853. The next prime is 6918943. The reversal of 6918891 is 1988196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6918891 - 2⁶ = 6918827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6918851) 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 in 7 ways as a sum of consecutive naturals, for example, 164715 + ... + 164756.

It is an arithmetic number, because the mean of its divisors is an integer number (1317888).

Almost surely, 2^6918891 is an apocalyptic number.

6918891 is a deficient number, since it is larger than the sum of its proper divisors (3624213).

6918891 is a wasteful number, since it uses less digits than its factorization.

6918891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329481.

The product of its digits is 31104, while the sum is 42.

The square root of 6918891 is about 2630.3784898756. The cubic root of 6918891 is about 190.5514083397.

The spelling of 6918891 in words is "six million, nine hundred eighteen thousand, eight hundred ninety-one".