72091171 has 2 divisors, whose sum is σ = 72091172. Its totient is φ = 72091170.

The previous prime is 72091163. The next prime is 72091211. The reversal of 72091171 is 17119027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72091171 - 2³ = 72091163 is a prime.

It is not a weakly prime, because it can be changed into another prime (72091121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36045585 + 36045586.

It is an arithmetic number, because the mean of its divisors is an integer number (36045586).

Almost surely, 2^72091171 is an apocalyptic number.

72091171 is a deficient number, since it is larger than the sum of its proper divisors (1).

72091171 is an equidigital number, since it uses as much as digits as its factorization.

72091171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 72091171 is about 8490.6519773219. The cubic root of 72091171 is about 416.1922862144.

The spelling of 72091171 in words is "seventy-two million, ninety-one thousand, one hundred seventy-one".