72129571 has 2 divisors, whose sum is σ = 72129572. Its totient is φ = 72129570.

The previous prime is 72129569. The next prime is 72129601. The reversal of 72129571 is 17592127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72129571 - 2¹ = 72129569 is a prime.

Together with 72129569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72129271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36064785 + 36064786.

It is an arithmetic number, because the mean of its divisors is an integer number (36064786).

Almost surely, 2^72129571 is an apocalyptic number.

72129571 is a deficient number, since it is larger than the sum of its proper divisors (1).

72129571 is an equidigital number, since it uses as much as digits as its factorization.

72129571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 34.

The square root of 72129571 is about 8492.9129867202. The cubic root of 72129571 is about 416.2661692655.

The spelling of 72129571 in words is "seventy-two million, one hundred twenty-nine thousand, five hundred seventy-one".