1911635728129 has 2 divisors, whose sum is σ = 1911635728130. Its totient is φ = 1911635728128.

The previous prime is 1911635728103. The next prime is 1911635728133. The reversal of 1911635728129 is 9218275361191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1685188229904 + 226447498225 = 1298148^2 + 475865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911635728129 - 2²⁵ = 1911602173697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1911635728129.

It is not a weakly prime, because it can be changed into another prime (1911635728729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955817864064 + 955817864065.

It is an arithmetic number, because the mean of its divisors is an integer number (955817864065).

Almost surely, 2^{1911635728129} is an apocalyptic number.

It is an amenable number.

1911635728129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911635728129 is an equidigital number, since it uses as much as digits as its factorization.

1911635728129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 55.

The spelling of 1911635728129 in words is "one trillion, nine hundred eleven billion, six hundred thirty-five million, seven hundred twenty-eight thousand, one hundred twenty-nine".