72117271 has 2 divisors, whose sum is σ = 72117272. Its totient is φ = 72117270.

The previous prime is 72117263. The next prime is 72117307. The reversal of 72117271 is 17271127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72117271 - 2³ = 72117263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72117371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36058635 + 36058636.

It is an arithmetic number, because the mean of its divisors is an integer number (36058636).

Almost surely, 2^72117271 is an apocalyptic number.

72117271 is a deficient number, since it is larger than the sum of its proper divisors (1).

72117271 is an equidigital number, since it uses as much as digits as its factorization.

72117271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1372, while the sum is 28.

The square root of 72117271 is about 8492.1888226770. The cubic root of 72117271 is about 416.2425064558.

Adding to 72117271 its reverse (17271127), we get a palindrome (89388398).

The spelling of 72117271 in words is "seventy-two million, one hundred seventeen thousand, two hundred seventy-one".