5561915129 has 2 divisors, whose sum is σ = 5561915130. Its totient is φ = 5561915128.

The previous prime is 5561915119. The next prime is 5561915137. The reversal of 5561915129 is 9215191655.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5127276025 + 434639104 = 71605^2 + 20848^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561915129 - 2⁴ = 5561915113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5561915129.

It is not a weakly prime, because it can be changed into another prime (5561915119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780957564 + 2780957565.

It is an arithmetic number, because the mean of its divisors is an integer number (2780957565).

Almost surely, 2^5561915129 is an apocalyptic number.

It is an amenable number.

5561915129 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561915129 is an equidigital number, since it uses as much as digits as its factorization.

5561915129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 44.

The square root of 5561915129 is about 74578.2483637153. The cubic root of 5561915129 is about 1771.7731631198.

The spelling of 5561915129 in words is "five billion, five hundred sixty-one million, nine hundred fifteen thousand, one hundred twenty-nine".