71522561 has 8 divisors (see below), whose sum is σ = 79304448. Its totient is φ = 63954000.

The previous prime is 71522551. The next prime is 71522597. The reversal of 71522561 is 16522517.

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

It is not a de Polignac number, because 71522561 - 2¹⁰ = 71521537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71522501) 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, 52625 + ... + 53966.

It is an arithmetic number, because the mean of its divisors is an integer number (9913056).

Almost surely, 2^71522561 is an apocalyptic number.

It is an amenable number.

71522561 is a deficient number, since it is larger than the sum of its proper divisors (7781887).

71522561 is a wasteful number, since it uses less digits than its factorization.

71522561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106663.

The product of its digits is 4200, while the sum is 29.

The square root of 71522561 is about 8457.1012173203. The cubic root of 71522561 is about 415.0951753452.

The spelling of 71522561 in words is "seventy-one million, five hundred twenty-two thousand, five hundred sixty-one".