6704531991 has 12 divisors (see below), whose sum is σ = 9749321400. Its totient is φ = 4439689200.

The previous prime is 6704531987. The next prime is 6704532001. The reversal of 6704531991 is 1991354076.

6704531991 is a `hidden beast` number, since 6 + 7 + 0 + 453 + 199 + 1 = 666.

It is not a de Polignac number, because 6704531991 - 2² = 6704531987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6704539991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2498485 + ... + 2501166.

It is an arithmetic number, because the mean of its divisors is an integer number (812443450).

Almost surely, 2^6704531991 is an apocalyptic number.

6704531991 is a deficient number, since it is larger than the sum of its proper divisors (3044789409).

6704531991 is a wasteful number, since it uses less digits than its factorization.

6704531991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999806 (or 4999803 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 6704531991 is about 81881.2065800205. The cubic root of 6704531991 is about 1885.6285962071.

The spelling of 6704531991 in words is "six billion, seven hundred four million, five hundred thirty-one thousand, nine hundred ninety-one".