73331721 has 12 divisors (see below), whose sum is σ = 106366260. Its totient is φ = 48683520.

The previous prime is 73331707. The next prime is 73331723. The reversal of 73331721 is 12713337.

It can be written as a sum of positive squares in 2 ways, for example, as 48441600 + 24890121 = 6960^2 + 4989^2 .

It is not a de Polignac number, because 73331721 - 2¹⁴ = 73315337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73331723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14736 + ... + 19073.

It is an arithmetic number, because the mean of its divisors is an integer number (8863855).

Almost surely, 2^73331721 is an apocalyptic number.

It is an amenable number.

73331721 is a deficient number, since it is larger than the sum of its proper divisors (33034539).

73331721 is a wasteful number, since it uses less digits than its factorization.

73331721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34056 (or 34053 counting only the distinct ones).

The product of its digits is 2646, while the sum is 27.

The square root of 73331721 is about 8563.3942452745. The cubic root of 73331721 is about 418.5660109215.

The spelling of 73331721 in words is "seventy-three million, three hundred thirty-one thousand, seven hundred twenty-one".