6991071 has 8 divisors (see below), whose sum is σ = 9497520. Its totient is φ = 4572672.

The previous prime is 6991043. The next prime is 6991091. The reversal of 6991071 is 1701996.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6991071 - 2⁹ = 6990559 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21826 + ... + 22143.

It is an arithmetic number, because the mean of its divisors is an integer number (1187190).

Almost surely, 2^6991071 is an apocalyptic number.

6991071 is a deficient number, since it is larger than the sum of its proper divisors (2506449).

6991071 is a wasteful number, since it uses less digits than its factorization.

6991071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44025.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 6991071 is about 2644.0633502244. The cubic root of 6991071 is about 191.2117476574.

It can be divided in two parts, 699 and 1071, that added together give a triangular number (1770 = T₅₉).

The spelling of 6991071 in words is "six million, nine hundred ninety-one thousand, seventy-one".