6908991 has 8 divisors (see below), whose sum is σ = 9236784. Its totient is φ = 4593600.

The previous prime is 6908983. The next prime is 6908999. The reversal of 6908991 is 1998096.

It is an interprime number because it is at equal distance from previous prime (6908983) and next prime (6908999).

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

It is not a de Polignac number, because 6908991 - 2³ = 6908983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6908999) 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, 1710 + ... + 4091.

It is an arithmetic number, because the mean of its divisors is an integer number (1154598).

Almost surely, 2^6908991 is an apocalyptic number.

6908991 is a deficient number, since it is larger than the sum of its proper divisors (2327793).

6908991 is a wasteful number, since it uses less digits than its factorization.

6908991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 6908991 is about 2628.4959577675. The cubic root of 6908991 is about 190.4604805009.

It can be divided in two parts, 690899 and 1, that added together give a triangular number (690900 = T₁₁₇₅).

The spelling of 6908991 in words is "six million, nine hundred eight thousand, nine hundred ninety-one".