72157161 has 8 divisors (see below), whose sum is σ = 96419200. Its totient is φ = 47999952.

The previous prime is 72157159. The next prime is 72157199. The reversal of 72157161 is 16175127.

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

It is not a de Polignac number, because 72157161 - 2¹ = 72157159 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 (72157121) 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, 24586 + ... + 27363.

It is an arithmetic number, because the mean of its divisors is an integer number (12052400).

Almost surely, 2^72157161 is an apocalyptic number.

It is an amenable number.

72157161 is a deficient number, since it is larger than the sum of its proper divisors (24262039).

72157161 is a wasteful number, since it uses less digits than its factorization.

72157161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52415.

The product of its digits is 2940, while the sum is 30.

The square root of 72157161 is about 8494.5371268834. The cubic root of 72157161 is about 416.3192372811.

It can be divided in two parts, 7215 and 7161, that multiplied together give a palindrome (51666615).

The spelling of 72157161 in words is "seventy-two million, one hundred fifty-seven thousand, one hundred sixty-one".