6945991 has 4 divisors (see below), whose sum is σ = 7480312. Its totient is φ = 6411672.

The previous prime is 6945959. The next prime is 6946003. The reversal of 6945991 is 1995496.

6945991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6945991 - 2⁵ = 6945959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6945941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267141 + ... + 267166.

It is an arithmetic number, because the mean of its divisors is an integer number (1870078).

Almost surely, 2^6945991 is an apocalyptic number.

6945991 is a deficient number, since it is larger than the sum of its proper divisors (534321).

6945991 is a wasteful number, since it uses less digits than its factorization.

6945991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534320.

The product of its digits is 87480, while the sum is 43.

The square root of 6945991 is about 2635.5248054230. The cubic root of 6945991 is about 190.7998689543.

The spelling of 6945991 in words is "six million, nine hundred forty-five thousand, nine hundred ninety-one".