7691 has 2 divisors, whose sum is σ = 7692. Its totient is φ = 7690.

The previous prime is 7687. The next prime is 7699. The reversal of 7691 is 1967.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7691 - 2² = 7687 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (7699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3845 + 3846.

It is an arithmetic number, because the mean of its divisors is an integer number (3846).

2⁷⁶⁹¹ is an apocalyptic number.

7691 is a deficient number, since it is larger than the sum of its proper divisors (1).

7691 is an equidigital number, since it uses as much as digits as its factorization.

7691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378, while the sum is 23.

The square root of 7691 is about 87.6983466207. The cubic root of 7691 is about 19.7391116610.

The spelling of 7691 in words is "seven thousand, six hundred ninety-one".