6891155 has 4 divisors (see below), whose sum is σ = 8269392. Its totient is φ = 5512920.

The previous prime is 6891149. The next prime is 6891161. The reversal of 6891155 is 5511986.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6891149) and next prime (6891161).

It is not a de Polignac number, because 6891155 - 2¹² = 6887059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 689111 + ... + 689120.

It is an arithmetic number, because the mean of its divisors is an integer number (2067348).

Almost surely, 2^6891155 is an apocalyptic number.

6891155 is a deficient number, since it is larger than the sum of its proper divisors (1378237).

6891155 is a wasteful number, since it uses less digits than its factorization.

6891155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378236.

The product of its digits is 10800, while the sum is 35.

The square root of 6891155 is about 2625.1009504398. The cubic root of 6891155 is about 190.2964439788.

The spelling of 6891155 in words is "six million, eight hundred ninety-one thousand, one hundred fifty-five".