73731561 has 8 divisors (see below), whose sum is σ = 98384160. Its totient is φ = 49116672.

The previous prime is 73731527. The next prime is 73731563. The reversal of 73731561 is 16513737.

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

It is not a de Polignac number, because 73731561 - 2¹⁴ = 73715177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73731563) 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, 4495 + ... + 12948.

It is an arithmetic number, because the mean of its divisors is an integer number (12298020).

Almost surely, 2^73731561 is an apocalyptic number.

It is an amenable number.

73731561 is a deficient number, since it is larger than the sum of its proper divisors (24652599).

73731561 is a wasteful number, since it uses less digits than its factorization.

73731561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18855.

The product of its digits is 13230, while the sum is 33.

The square root of 73731561 is about 8586.7083914618. The cubic root of 73731561 is about 419.3253738763.

The spelling of 73731561 in words is "seventy-three million, seven hundred thirty-one thousand, five hundred sixty-one".