1215547907129 has 2 divisors, whose sum is σ = 1215547907130. Its totient is φ = 1215547907128.

The previous prime is 1215547907099. The next prime is 1215547907153. The reversal of 1215547907129 is 9217097455121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977828277904 + 237719629225 = 988852^2 + 487565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215547907129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215547807129) 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 as a sum of consecutive naturals, namely, 607773953564 + 607773953565.

It is an arithmetic number, because the mean of its divisors is an integer number (607773953565).

Almost surely, 2^{1215547907129} is an apocalyptic number.

It is an amenable number.

1215547907129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215547907129 is an equidigital number, since it uses as much as digits as its factorization.

1215547907129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 1215547907129 in words is "one trillion, two hundred fifteen billion, five hundred forty-seven million, nine hundred seven thousand, one hundred twenty-nine".