71409221 has 8 divisors (see below), whose sum is σ = 76980960. Its totient is φ = 65848752.

The previous prime is 71409211. The next prime is 71409229. The reversal of 71409221 is 12290417.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71409221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71409229) 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 7 ways as a sum of consecutive naturals, for example, 14186 + ... + 18548.

It is an arithmetic number, because the mean of its divisors is an integer number (9622620).

Almost surely, 2^71409221 is an apocalyptic number.

It is an amenable number.

71409221 is a deficient number, since it is larger than the sum of its proper divisors (5571739).

71409221 is a wasteful number, since it uses less digits than its factorization.

71409221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 71409221 is about 8450.3976829496. The cubic root of 71409221 is about 414.8757958014.

Adding to 71409221 its reverse (12290417), we get a palindrome (83699638).

It can be divided in two parts, 7140 and 9221, that added together give a palindrome (16361).

The spelling of 71409221 in words is "seventy-one million, four hundred nine thousand, two hundred twenty-one".