73533521 has 4 divisors (see below), whose sum is σ = 75098112. Its totient is φ = 71968932.

The previous prime is 73533511. The next prime is 73533533. The reversal of 73533521 is 12533537.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12533537 = 47 ⋅266671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73533521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73533511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782225 + ... + 782318.

It is an arithmetic number, because the mean of its divisors is an integer number (18774528).

Almost surely, 2^73533521 is an apocalyptic number.

It is an amenable number.

73533521 is a deficient number, since it is larger than the sum of its proper divisors (1564591).

73533521 is a wasteful number, since it uses less digits than its factorization.

73533521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564590.

The product of its digits is 9450, while the sum is 29.

The square root of 73533521 is about 8575.1688613111. The cubic root of 73533521 is about 418.9496068945.

The spelling of 73533521 in words is "seventy-three million, five hundred thirty-three thousand, five hundred twenty-one".