6991769105 has 4 divisors (see below), whose sum is σ = 8390122932. Its totient is φ = 5593415280.

The previous prime is 6991769089. The next prime is 6991769243. The reversal of 6991769105 is 5019671996.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1141966849 + 5849802256 = 33793^2 + 76484^2 .

It is not a de Polignac number, because 6991769105 - 2⁴ = 6991769089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699176906 + ... + 699176915.

It is an arithmetic number, because the mean of its divisors is an integer number (2097530733).

Almost surely, 2^6991769105 is an apocalyptic number.

It is an amenable number.

6991769105 is a deficient number, since it is larger than the sum of its proper divisors (1398353827).

6991769105 is a wasteful number, since it uses less digits than its factorization.

6991769105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398353826.

The product of its (nonzero) digits is 918540, while the sum is 53.

The square root of 6991769105 is about 83616.7991793515. The cubic root of 6991769105 is about 1912.1811203435.

The spelling of 6991769105 in words is "six billion, nine hundred ninety-one million, seven hundred sixty-nine thousand, one hundred five".