5115561509 has 2 divisors, whose sum is σ = 5115561510. Its totient is φ = 5115561508.

The previous prime is 5115561469. The next prime is 5115561523. The reversal of 5115561509 is 9051655115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3393062500 + 1722499009 = 58250^2 + 41503^2 .

It is a cyclic number.

It is not a de Polignac number, because 5115561509 - 2²⁴ = 5098784293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5115561589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2557780754 + 2557780755.

It is an arithmetic number, because the mean of its divisors is an integer number (2557780755).

Almost surely, 2^5115561509 is an apocalyptic number.

It is an amenable number.

5115561509 is a deficient number, since it is larger than the sum of its proper divisors (1).

5115561509 is an equidigital number, since it uses as much as digits as its factorization.

5115561509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33750, while the sum is 38.

The square root of 5115561509 is about 71523.1536567006. The cubic root of 5115561509 is about 1723.0495643424.

The spelling of 5115561509 in words is "five billion, one hundred fifteen million, five hundred sixty-one thousand, five hundred nine".