8541513817 has 2 divisors, whose sum is σ = 8541513818. Its totient is φ = 8541513816.

The previous prime is 8541513809. The next prime is 8541513829. The reversal of 8541513817 is 7183151458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6231365721 + 2310148096 = 78939^2 + 48064^2 .

It is a cyclic number.

It is not a de Polignac number, because 8541513817 - 2³ = 8541513809 is a prime.

It is not a weakly prime, because it can be changed into another prime (8541513217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4270756908 + 4270756909.

It is an arithmetic number, because the mean of its divisors is an integer number (4270756909).

Almost surely, 2^8541513817 is an apocalyptic number.

It is an amenable number.

8541513817 is a deficient number, since it is larger than the sum of its proper divisors (1).

8541513817 is an equidigital number, since it uses as much as digits as its factorization.

8541513817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 43.

The square root of 8541513817 is about 92420.3106302938. The cubic root of 8541513817 is about 2044.1446092652.

The spelling of 8541513817 in words is "eight billion, five hundred forty-one million, five hundred thirteen thousand, eight hundred seventeen".