72531171 has 12 divisors (see below), whose sum is σ = 104997672. Its totient is φ = 48247776.

The previous prime is 72531161. The next prime is 72531181. The reversal of 72531171 is 17113527.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72531161) and next prime (72531181).

It is not a de Polignac number, because 72531171 - 2⁵ = 72531139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72531101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4426 + ... + 12831.

It is an arithmetic number, because the mean of its divisors is an integer number (8749806).

Almost surely, 2^72531171 is an apocalyptic number.

72531171 is a deficient number, since it is larger than the sum of its proper divisors (32466501).

72531171 is a wasteful number, since it uses less digits than its factorization.

72531171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17730 (or 17727 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 72531171 is about 8516.5234104064. The cubic root of 72531171 is about 417.0372963208.

Adding to 72531171 its reverse (17113527), we get a palindrome (89644698).

The spelling of 72531171 in words is "seventy-two million, five hundred thirty-one thousand, one hundred seventy-one".