999961129 has 2 divisors, whose sum is σ = 999961130. Its totient is φ = 999961128.

The previous prime is 999961091. The next prime is 999961139. The reversal of 999961129 is 921169999.

999961129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 982697104 + 17264025 = 31348^2 + 4155^2 .

It is an emirp because it is prime and its reverse (921169999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999961129 - 2¹⁵ = 999928361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999961129.

It is not a weakly prime, because it can be changed into another prime (999961139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980564 + 499980565.

It is an arithmetic number, because the mean of its divisors is an integer number (499980565).

Almost surely, 2^999961129 is an apocalyptic number.

It is an amenable number.

999961129 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961129 is an equidigital number, since it uses as much as digits as its factorization.

999961129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 55.

The square root of 999961129 is about 31622.1619912365. The cubic root of 999961129 is about 999.9870428321.

The spelling of 999961129 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, one hundred twenty-nine".