8610513721 has 2 divisors, whose sum is σ = 8610513722. Its totient is φ = 8610513720.

The previous prime is 8610513701. The next prime is 8610513757. The reversal of 8610513721 is 1273150168.

It is a happy number.

8610513721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4605522496 + 4004991225 = 67864^2 + 63285^2 .

It is a cyclic number.

It is not a de Polignac number, because 8610513721 - 2¹¹ = 8610511673 is a prime.

It is not a weakly prime, because it can be changed into another prime (8610513701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4305256860 + 4305256861.

It is an arithmetic number, because the mean of its divisors is an integer number (4305256861).

Almost surely, 2^8610513721 is an apocalyptic number.

It is an amenable number.

8610513721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8610513721 is an equidigital number, since it uses as much as digits as its factorization.

8610513721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 8610513721 is about 92792.8538250656. The cubic root of 8610513721 is about 2049.6341779116.

Adding to 8610513721 its reverse (1273150168), we get a palindrome (9883663889).

The spelling of 8610513721 in words is "eight billion, six hundred ten million, five hundred thirteen thousand, seven hundred twenty-one".