71312530 has 16 divisors (see below), whose sum is σ = 131494104. Its totient is φ = 27829120.

The previous prime is 71312513. The next prime is 71312531. The reversal of 71312530 is 3521317.

It can be written as a sum of positive squares in 4 ways, for example, as 55368481 + 15944049 = 7441^2 + 3993^2 .

It is not an unprimeable number, because it can be changed into a prime (71312531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86557 + ... + 87376.

Almost surely, 2^71312530 is an apocalyptic number.

71312530 is a deficient number, since it is larger than the sum of its proper divisors (60181574).

71312530 is a wasteful number, since it uses less digits than its factorization.

71312530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173981.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 71312530 is about 8444.6746532948. The cubic root of 71312530 is about 414.6884583011.

Adding to 71312530 its reverse (3521317), we get a palindrome (74833847).

The spelling of 71312530 in words is "seventy-one million, three hundred twelve thousand, five hundred thirty".