71589521 has 2 divisors, whose sum is σ = 71589522. Its totient is φ = 71589520.

The previous prime is 71589503. The next prime is 71589577. The reversal of 71589521 is 12598517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 14737921 = 7540^2 + 3839^2 .

It is an emirp because it is prime and its reverse (12598517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71589521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71589121) 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, 35794760 + 35794761.

It is an arithmetic number, because the mean of its divisors is an integer number (35794761).

Almost surely, 2^71589521 is an apocalyptic number.

It is an amenable number.

71589521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71589521 is an equidigital number, since it uses as much as digits as its factorization.

71589521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 38.

The square root of 71589521 is about 8461.0590944633. The cubic root of 71589521 is about 415.2246734279.

The spelling of 71589521 in words is "seventy-one million, five hundred eighty-nine thousand, five hundred twenty-one".