6991005 has 32 divisors (see below), whose sum is σ = 12902400. Its totient is φ = 3166272.

The previous prime is 6991003. The next prime is 6991013. The reversal of 6991005 is 5001996.

It is not a de Polignac number, because 6991005 - 2¹ = 6991003 is a prime.

6991005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991003) 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 31 ways as a sum of consecutive naturals, for example, 14356 + ... + 14834.

It is an arithmetic number, because the mean of its divisors is an integer number (403200).

Almost surely, 2^6991005 is an apocalyptic number.

It is an amenable number.

6991005 is a deficient number, since it is larger than the sum of its proper divisors (5911395).

6991005 is a wasteful number, since it uses less digits than its factorization.

6991005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 6991005 is about 2644.0508694047. The cubic root of 6991005 is about 191.2111459367.

The spelling of 6991005 in words is "six million, nine hundred ninety-one thousand, five".