6991136 has 24 divisors (see below), whose sum is σ = 13846140. Its totient is φ = 3474688.

The previous prime is 6991133. The next prime is 6991147. The reversal of 6991136 is 6311996.

It can be written as a sum of positive squares in 2 ways, for example, as 6990736 + 400 = 2644^2 + 20^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6991096 and 6991105.

It is not an unprimeable number, because it can be changed into a prime (6991133) 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, 5750 + ... + 6858.

Almost surely, 2^6991136 is an apocalyptic number.

It is an amenable number.

6991136 is a deficient number, since it is larger than the sum of its proper divisors (6855004).

6991136 is a wasteful number, since it uses less digits than its factorization.

6991136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1308 counting only the distinct ones).

The product of its digits is 8748, while the sum is 35.

The square root of 6991136 is about 2644.0756418832. The cubic root of 6991136 is about 191.2123402573.

The spelling of 6991136 in words is "six million, nine hundred ninety-one thousand, one hundred thirty-six".