73031309 has 16 divisors (see below), whose sum is σ = 81755520. Its totient is φ = 64774080.

The previous prime is 73031293. The next prime is 73031311. The reversal of 73031309 is 90313037.

It is a cyclic number.

It is not a de Polignac number, because 73031309 - 2⁴ = 73031293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73031359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115424 + ... + 116054.

It is an arithmetic number, because the mean of its divisors is an integer number (5109720).

Almost surely, 2^73031309 is an apocalyptic number.

It is an amenable number.

73031309 is a deficient number, since it is larger than the sum of its proper divisors (8724211).

73031309 is a wasteful number, since it uses less digits than its factorization.

73031309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 1701, while the sum is 26.

The square root of 73031309 is about 8545.8357695430. The cubic root of 73031309 is about 417.9936603817.

The spelling of 73031309 in words is "seventy-three million, thirty-one thousand, three hundred nine".