7691891 has 2 divisors, whose sum is σ = 7691892. Its totient is φ = 7691890.

The previous prime is 7691863. The next prime is 7691897. The reversal of 7691891 is 1981967.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7691891 - 2¹⁰ = 7690867 is a prime.

It is not a weakly prime, because it can be changed into another prime (7691897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3845945 + 3845946.

It is an arithmetic number, because the mean of its divisors is an integer number (3845946).

Almost surely, 2^7691891 is an apocalyptic number.

7691891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7691891 is an equidigital number, since it uses as much as digits as its factorization.

7691891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 7691891 is about 2773.4258598347. The cubic root of 7691891 is about 197.3987388829.

The spelling of 7691891 in words is "seven million, six hundred ninety-one thousand, eight hundred ninety-one".