71417521 has 16 divisors (see below), whose sum is σ = 84567040. Its totient is φ = 59019840.

The previous prime is 71417509. The next prime is 71417537. The reversal of 71417521 is 12571417.

It is a cyclic number.

It is not a de Polignac number, because 71417521 - 2⁹ = 71417009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71417521.

It is not an unprimeable number, because it can be changed into a prime (71417321) 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, 85735 + ... + 86563.

It is an arithmetic number, because the mean of its divisors is an integer number (5285440).

Almost surely, 2^71417521 is an apocalyptic number.

It is an amenable number.

71417521 is a deficient number, since it is larger than the sum of its proper divisors (13149519).

71417521 is a wasteful number, since it uses less digits than its factorization.

71417521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264.

The product of its digits is 1960, while the sum is 28.

The square root of 71417521 is about 8450.8887698277. Note that the first 3 decimals coincide. The cubic root of 71417521 is about 414.8918690557.

Adding to 71417521 its reverse (12571417), we get a palindrome (83988938).

The spelling of 71417521 in words is "seventy-one million, four hundred seventeen thousand, five hundred twenty-one".