6915891 has 8 divisors (see below), whose sum is σ = 9539280. Its totient is φ = 4451552.

The previous prime is 6915871. The next prime is 6915901. The reversal of 6915891 is 1985196.

6915891 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6915891 - 2⁶ = 6915827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6915841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39660 + ... + 39833.

It is an arithmetic number, because the mean of its divisors is an integer number (1192410).

Almost surely, 2^6915891 is an apocalyptic number.

6915891 is a deficient number, since it is larger than the sum of its proper divisors (2623389).

6915891 is a wasteful number, since it uses less digits than its factorization.

6915891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79525.

The product of its digits is 19440, while the sum is 39.

The square root of 6915891 is about 2629.8081679088. The cubic root of 6915891 is about 190.5238636138.

The spelling of 6915891 in words is "six million, nine hundred fifteen thousand, eight hundred ninety-one".