7973509 has 2 divisors, whose sum is σ = 7973510. Its totient is φ = 7973508.

The previous prime is 7973489. The next prime is 7973519. The reversal of 7973509 is 9053797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7924225 + 49284 = 2815^2 + 222^2 .

It is an emirp because it is prime and its reverse (9053797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7973509 - 2⁵ = 7973477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7973519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986754 + 3986755.

It is an arithmetic number, because the mean of its divisors is an integer number (3986755).

Almost surely, 2^7973509 is an apocalyptic number.

It is an amenable number.

7973509 is a deficient number, since it is larger than the sum of its proper divisors (1).

7973509 is an equidigital number, since it uses as much as digits as its factorization.

7973509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59535, while the sum is 40.

The square root of 7973509 is about 2823.7402500938. The cubic root of 7973509 is about 199.7789975462.

The spelling of 7973509 in words is "seven million, nine hundred seventy-three thousand, five hundred nine".