72530171 has 4 divisors (see below), whose sum is σ = 82891632. Its totient is φ = 62168712.

The previous prime is 72530153. The next prime is 72530179. The reversal of 72530171 is 17103527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17103527 = 7 ⋅2443361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72530171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72530171.

It is not an unprimeable number, because it can be changed into a prime (72530179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5180720 + ... + 5180733.

It is an arithmetic number, because the mean of its divisors is an integer number (20722908).

Almost surely, 2^72530171 is an apocalyptic number.

72530171 is a deficient number, since it is larger than the sum of its proper divisors (10361461).

72530171 is a wasteful number, since it uses less digits than its factorization.

72530171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10361460.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 72530171 is about 8516.4647008016. The cubic root of 72530171 is about 417.0353797232.

Adding to 72530171 its reverse (17103527), we get a palindrome (89633698).

The spelling of 72530171 in words is "seventy-two million, five hundred thirty thousand, one hundred seventy-one".