73242809 has 2 divisors, whose sum is σ = 73242810. Its totient is φ = 73242808.

The previous prime is 73242797. The next prime is 73242811. The reversal of 73242809 is 90824237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67289209 + 5953600 = 8203^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 73242809 - 2²⁴ = 56465593 is a prime.

Together with 73242811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73242839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36621404 + 36621405.

It is an arithmetic number, because the mean of its divisors is an integer number (36621405).

Almost surely, 2^73242809 is an apocalyptic number.

It is an amenable number.

73242809 is a deficient number, since it is larger than the sum of its proper divisors (1).

73242809 is an equidigital number, since it uses as much as digits as its factorization.

73242809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 73242809 is about 8558.2012712953. The cubic root of 73242809 is about 418.3967772365.

The spelling of 73242809 in words is "seventy-three million, two hundred forty-two thousand, eight hundred nine".