73521513 has 20 divisors (see below), whose sum is σ = 118278468. Its totient is φ = 45243360.

The previous prime is 73521463. The next prime is 73521527. The reversal of 73521513 is 31512537.

It can be written as a sum of positive squares in 2 ways, for example, as 8928144 + 64593369 = 2988^2 + 8037^2 .

It is not a de Polignac number, because 73521513 - 2⁶ = 73521449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73521533) 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 19 ways as a sum of consecutive naturals, for example, 33858 + ... + 35963.

Almost surely, 2^73521513 is an apocalyptic number.

It is an amenable number.

73521513 is a deficient number, since it is larger than the sum of its proper divisors (44756955).

73521513 is a wasteful number, since it uses less digits than its factorization.

73521513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69846 (or 69837 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 73521513 is about 8574.4686715854. The cubic root of 73521513 is about 418.9268008750.

The spelling of 73521513 in words is "seventy-three million, five hundred twenty-one thousand, five hundred thirteen".