73163809 has 2 divisors, whose sum is σ = 73163810. Its totient is φ = 73163808.

The previous prime is 73163807. The next prime is 73163821. The reversal of 73163809 is 90836137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73153809 + 10000 = 8553^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 73163809 - 2¹ = 73163807 is a prime.

Together with 73163807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (73163807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36581904 + 36581905.

It is an arithmetic number, because the mean of its divisors is an integer number (36581905).

Almost surely, 2^73163809 is an apocalyptic number.

It is an amenable number.

73163809 is a deficient number, since it is larger than the sum of its proper divisors (1).

73163809 is an equidigital number, since it uses as much as digits as its factorization.

73163809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 73163809 is about 8553.5845702255. The cubic root of 73163809 is about 418.2462949488.

The spelling of 73163809 in words is "seventy-three million, one hundred sixty-three thousand, eight hundred nine".