71121530 has 8 divisors (see below), whose sum is σ = 128018772. Its totient is φ = 28448608.

The previous prime is 71121529. The next prime is 71121553. The reversal of 71121530 is 3512117.

It can be written as a sum of positive squares in 2 ways, for example, as 68740681 + 2380849 = 8291^2 + 1543^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3556067 + ... + 3556086.

Almost surely, 2^71121530 is an apocalyptic number.

71121530 is a deficient number, since it is larger than the sum of its proper divisors (56897242).

71121530 is a wasteful number, since it uses less digits than its factorization.

71121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112160.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 71121530 is about 8433.3581686064. The cubic root of 71121530 is about 414.3179001663.

Adding to 71121530 its reverse (3512117), we get a palindrome (74633647).

The spelling of 71121530 in words is "seventy-one million, one hundred twenty-one thousand, five hundred thirty".