72145171 has 8 divisors (see below), whose sum is σ = 82520064. Its totient is φ = 61787400.

The previous prime is 72145163. The next prime is 72145187. The reversal of 72145171 is 17154127.

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

It is a cyclic number.

It is not a de Polignac number, because 72145171 - 2³ = 72145163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72145121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6606 + ... + 13708.

It is an arithmetic number, because the mean of its divisors is an integer number (10315008).

Almost surely, 2^72145171 is an apocalyptic number.

72145171 is a deficient number, since it is larger than the sum of its proper divisors (10374893).

72145171 is a wasteful number, since it uses less digits than its factorization.

72145171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its digits is 1960, while the sum is 28.

The square root of 72145171 is about 8493.8313498680. The cubic root of 72145171 is about 416.2961767648.

Adding to 72145171 its reverse (17154127), we get a palindrome (89299298).

The spelling of 72145171 in words is "seventy-two million, one hundred forty-five thousand, one hundred seventy-one".