73521331 has 8 divisors (see below), whose sum is σ = 81317264. Its totient is φ = 66031200.

The previous prime is 73521307. The next prime is 73521337. The reversal of 73521331 is 13312537.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73521331 - 2²¹ = 71424179 is a prime.

It is a super-2 number, since 2×73521331² = 10810772224023122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73521296 and 73521305.

It is not an unprimeable number, because it can be changed into a prime (73521337) 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 7 ways as a sum of consecutive naturals, for example, 75945 + ... + 76906.

It is an arithmetic number, because the mean of its divisors is an integer number (10164658).

Almost surely, 2^73521331 is an apocalyptic number.

73521331 is a deficient number, since it is larger than the sum of its proper divisors (7795933).

73521331 is a wasteful number, since it uses less digits than its factorization.

73521331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152901.

The product of its digits is 1890, while the sum is 25.

The square root of 73521331 is about 8574.4580586764. The cubic root of 73521331 is about 418.9264551950.

Adding to 73521331 its reverse (13312537), we get a palindrome (86833868).

The spelling of 73521331 in words is "seventy-three million, five hundred twenty-one thousand, three hundred thirty-one".