7995991 has 2 divisors, whose sum is σ = 7995992. Its totient is φ = 7995990.

The previous prime is 7995937. The next prime is 7996031. The reversal of 7995991 is 1995997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7995991 - 2⁷ = 7995863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7995901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3997995 + 3997996.

It is an arithmetic number, because the mean of its divisors is an integer number (3997996).

Almost surely, 2^7995991 is an apocalyptic number.

7995991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7995991 is an equidigital number, since it uses as much as digits as its factorization.

7995991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229635, while the sum is 49.

The square root of 7995991 is about 2827.7183381659. The cubic root of 7995991 is about 199.9665860845.

The spelling of 7995991 in words is "seven million, nine hundred ninety-five thousand, nine hundred ninety-one".