7971691 has 16 divisors (see below), whose sum is σ = 10390464. Its totient is φ = 5935104.

The previous prime is 7971683. The next prime is 7971701. The reversal of 7971691 is 1961797.

It is not a de Polignac number, because 7971691 - 2³ = 7971683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7971611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1030 + ... + 4123.

It is an arithmetic number, because the mean of its divisors is an integer number (649404).

Almost surely, 2^7971691 is an apocalyptic number.

7971691 is a deficient number, since it is larger than the sum of its proper divisors (2418773).

7971691 is a wasteful number, since it uses less digits than its factorization.

7971691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5190.

The product of its digits is 23814, while the sum is 40.

The square root of 7971691 is about 2823.4183182802. The cubic root of 7971691 is about 199.7638128546.

The spelling of 7971691 in words is "seven million, nine hundred seventy-one thousand, six hundred ninety-one".