73989161 has 4 divisors (see below), whose sum is σ = 74011332. Its totient is φ = 73966992.

The previous prime is 73989143. The next prime is 73989191. The reversal of 73989161 is 16198937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16198937 = 2143 ⋅7559.

It can be written as a sum of positive squares in 2 ways, for example, as 55875625 + 18113536 = 7475^2 + 4256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73989161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73989191) 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 3 ways as a sum of consecutive naturals, for example, 4946 + ... + 13131.

It is an arithmetic number, because the mean of its divisors is an integer number (18502833).

Almost surely, 2^73989161 is an apocalyptic number.

It is an amenable number.

73989161 is a deficient number, since it is larger than the sum of its proper divisors (22171).

73989161 is a wasteful number, since it uses less digits than its factorization.

73989161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22170.

The product of its digits is 81648, while the sum is 44.

The square root of 73989161 is about 8601.6952398931. The cubic root of 73989161 is about 419.8131462859.

The spelling of 73989161 in words is "seventy-three million, nine hundred eighty-nine thousand, one hundred sixty-one".