6691699 has 4 divisors (see below), whose sum is σ = 7647664. Its totient is φ = 5735736.

The previous prime is 6691697. The next prime is 6691723. The reversal of 6691699 is 9961966.

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 6691699 - 2¹ = 6691697 is a prime.

6691699 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477972 + ... + 477985.

It is an arithmetic number, because the mean of its divisors is an integer number (1911916).

Almost surely, 2^6691699 is an apocalyptic number.

6691699 is a deficient number, since it is larger than the sum of its proper divisors (955965).

6691699 is an equidigital number, since it uses as much as digits as its factorization.

6691699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955964.

The product of its digits is 157464, while the sum is 46.

The square root of 6691699 is about 2586.8318461006. The cubic root of 6691699 is about 188.4424748303.

The spelling of 6691699 in words is "six million, six hundred ninety-one thousand, six hundred ninety-nine".