71521061 has 8 divisors (see below), whose sum is σ = 74246400. Its totient is φ = 68821920.

The previous prime is 71521049. The next prime is 71521081. The reversal of 71521061 is 16012517.

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

It is a de Polignac number, because none of the positive numbers 2^k-71521061 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 (71521001) 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, 896 + ... + 11993.

It is an arithmetic number, because the mean of its divisors is an integer number (9280800).

Almost surely, 2^71521061 is an apocalyptic number.

It is an amenable number.

71521061 is a deficient number, since it is larger than the sum of its proper divisors (2725339).

71521061 is a wasteful number, since it uses less digits than its factorization.

71521061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13099.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 71521061 is about 8457.0125339862. The cubic root of 71521061 is about 415.0922734771.

Adding to 71521061 its reverse (16012517), we get a palindrome (87533578).

The spelling of 71521061 in words is "seventy-one million, five hundred twenty-one thousand, sixty-one".