7991573 has 2 divisors, whose sum is σ = 7991574. Its totient is φ = 7991572.

The previous prime is 7991569. The next prime is 7991579. The reversal of 7991573 is 3751997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7963684 + 27889 = 2822^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 7991573 - 2² = 7991569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7991573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7991579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995786 + 3995787.

It is an arithmetic number, because the mean of its divisors is an integer number (3995787).

Almost surely, 2^7991573 is an apocalyptic number.

It is an amenable number.

7991573 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991573 is an equidigital number, since it uses as much as digits as its factorization.

7991573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59535, while the sum is 41.

The square root of 7991573 is about 2826.9370350257. The cubic root of 7991573 is about 199.9297503278.

The spelling of 7991573 in words is "seven million, nine hundred ninety-one thousand, five hundred seventy-three".