72130161 has 8 divisors (see below), whose sum is σ = 96227104. Its totient is φ = 48060000.

The previous prime is 72130159. The next prime is 72130169. The reversal of 72130161 is 16103127.

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

It is not a de Polignac number, because 72130161 - 2¹ = 72130159 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 (72130169) 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, 786 + ... + 12036.

It is an arithmetic number, because the mean of its divisors is an integer number (12028388).

Almost surely, 2^72130161 is an apocalyptic number.

It is an amenable number.

72130161 is a deficient number, since it is larger than the sum of its proper divisors (24096943).

72130161 is a wasteful number, since it uses less digits than its factorization.

72130161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13391.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 72130161 is about 8492.9477214922. The cubic root of 72130161 is about 416.2673042432.

Adding to 72130161 its reverse (16103127), we get a palindrome (88233288).

The spelling of 72130161 in words is "seventy-two million, one hundred thirty thousand, one hundred sixty-one".