8153310721 has 4 divisors (see below), whose sum is σ = 8632917252. Its totient is φ = 7673704192.

The previous prime is 8153310709. The next prime is 8153310727. The reversal of 8153310721 is 1270133518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2862785025 + 5290525696 = 53505^2 + 72736^2 .

It is a cyclic number.

It is not a de Polignac number, because 8153310721 - 2⁷ = 8153310593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8153310727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239803240 + ... + 239803273.

It is an arithmetic number, because the mean of its divisors is an integer number (2158229313).

Almost surely, 2^8153310721 is an apocalyptic number.

It is an amenable number.

8153310721 is a deficient number, since it is larger than the sum of its proper divisors (479606531).

8153310721 is a wasteful number, since it uses less digits than its factorization.

8153310721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479606530.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 8153310721 is about 90295.6849522722. The cubic root of 8153310721 is about 2012.6951396289.

The spelling of 8153310721 in words is "eight billion, one hundred fifty-three million, three hundred ten thousand, seven hundred twenty-one".