71433521 has 16 divisors (see below), whose sum is σ = 77837760. Its totient is φ = 65329920.

The previous prime is 71433511. The next prime is 71433529. The reversal of 71433521 is 12533417.

It is a de Polignac number, because none of the positive numbers 2^k-71433521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71433529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82925 + ... + 83781.

It is an arithmetic number, because the mean of its divisors is an integer number (4864860).

Almost surely, 2^71433521 is an apocalyptic number.

It is an amenable number.

71433521 is a deficient number, since it is larger than the sum of its proper divisors (6404239).

71433521 is a wasteful number, since it uses less digits than its factorization.

71433521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its digits is 2520, while the sum is 26.

The square root of 71433521 is about 8451.8353628073. The cubic root of 71433521 is about 414.9228501284.

Adding to 71433521 its reverse (12533417), we get a palindrome (83966938).

The spelling of 71433521 in words is "seventy-one million, four hundred thirty-three thousand, five hundred twenty-one".