73481209 has 2 divisors, whose sum is σ = 73481210. Its totient is φ = 73481208.

The previous prime is 73481207. The next prime is 73481263. The reversal of 73481209 is 90218437.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73479184 + 2025 = 8572^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 73481209 - 2¹ = 73481207 is a prime.

It is a super-2 number, since 2×73481209² = 10798976152203362, which contains 22 as substring.

Together with 73481207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (73481201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36740604 + 36740605.

It is an arithmetic number, because the mean of its divisors is an integer number (36740605).

Almost surely, 2^73481209 is an apocalyptic number.

It is an amenable number.

73481209 is a deficient number, since it is larger than the sum of its proper divisors (1).

73481209 is an equidigital number, since it uses as much as digits as its factorization.

73481209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 73481209 is about 8572.1181163117. The cubic root of 73481209 is about 418.8502359289.

The spelling of 73481209 in words is "seventy-three million, four hundred eighty-one thousand, two hundred nine".