8172503509 has 2 divisors, whose sum is σ = 8172503510. Its totient is φ = 8172503508.

The previous prime is 8172503453. The next prime is 8172503539. The reversal of 8172503509 is 9053052718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7478444484 + 694059025 = 86478^2 + 26345^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172503509 - 2¹¹ = 8172501461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8172503539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086251754 + 4086251755.

It is an arithmetic number, because the mean of its divisors is an integer number (4086251755).

Almost surely, 2^8172503509 is an apocalyptic number.

It is an amenable number.

8172503509 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172503509 is an equidigital number, since it uses as much as digits as its factorization.

8172503509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 8172503509 is about 90401.8999191942. The cubic root of 8172503509 is about 2014.2731881509.

The spelling of 8172503509 in words is "eight billion, one hundred seventy-two million, five hundred three thousand, five hundred nine".