6691907 has 4 divisors (see below), whose sum is σ = 6834336. Its totient is φ = 6549480.

The previous prime is 6691903. The next prime is 6691943. The reversal of 6691907 is 7091966.

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 6691907 - 2² = 6691903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691903) 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, 71144 + ... + 71237.

It is an arithmetic number, because the mean of its divisors is an integer number (1708584).

Almost surely, 2^6691907 is an apocalyptic number.

6691907 is a deficient number, since it is larger than the sum of its proper divisors (142429).

6691907 is a wasteful number, since it uses less digits than its factorization.

6691907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142428.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 6691907 is about 2586.8720494064. The cubic root of 6691907 is about 188.4444272806. Note that the first 4 decimals are identical.

The spelling of 6691907 in words is "six million, six hundred ninety-one thousand, nine hundred seven".