7681691 has 2 divisors, whose sum is σ = 7681692. Its totient is φ = 7681690.

The previous prime is 7681657. The next prime is 7681693. The reversal of 7681691 is 1961867.

7681691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7681691 - 2¹⁰ = 7680667 is a prime.

Together with 7681693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7681693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840845 + 3840846.

It is an arithmetic number, because the mean of its divisors is an integer number (3840846).

Almost surely, 2^7681691 is an apocalyptic number.

7681691 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681691 is an equidigital number, since it uses as much as digits as its factorization.

7681691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 7681691 is about 2771.5863688509. The cubic root of 7681691 is about 197.3114453165.

The spelling of 7681691 in words is "seven million, six hundred eighty-one thousand, six hundred ninety-one".