71061521 has 8 divisors (see below), whose sum is σ = 71975904. Its totient is φ = 70151040.

The previous prime is 71061511. The next prime is 71061553. The reversal of 71061521 is 12516017.

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

It is a cyclic number.

It is not a de Polignac number, because 71061521 - 2¹⁰ = 71060497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71061511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54746 + ... + 56028.

It is an arithmetic number, because the mean of its divisors is an integer number (8996988).

Almost surely, 2^71061521 is an apocalyptic number.

It is an amenable number.

71061521 is a deficient number, since it is larger than the sum of its proper divisors (914383).

71061521 is a wasteful number, since it uses less digits than its factorization.

71061521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951.

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

The square root of 71061521 is about 8429.7995824337. The cubic root of 71061521 is about 414.2013400621.

Adding to 71061521 its reverse (12516017), we get a palindrome (83577538).

The spelling of 71061521 in words is "seventy-one million, sixty-one thousand, five hundred twenty-one".