71534221 has 16 divisors (see below), whose sum is σ = 82967040. Its totient is φ = 60991920.

The previous prime is 71534219. The next prime is 71534227. The reversal of 71534221 is 12243517.

It is a happy number.

It is not a de Polignac number, because 71534221 - 2¹ = 71534219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71534227) 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 in 15 ways as a sum of consecutive naturals, for example, 19866 + ... + 23188.

It is an arithmetic number, because the mean of its divisors is an integer number (5185440).

Almost surely, 2^71534221 is an apocalyptic number.

It is an amenable number.

71534221 is a deficient number, since it is larger than the sum of its proper divisors (11432819).

71534221 is a wasteful number, since it uses less digits than its factorization.

71534221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456.

The product of its digits is 1680, while the sum is 25.

The square root of 71534221 is about 8457.7905507290. The cubic root of 71534221 is about 415.1177311499.

Adding to 71534221 its reverse (12243517), we get a palindrome (83777738).

The spelling of 71534221 in words is "seventy-one million, five hundred thirty-four thousand, two hundred twenty-one".