1121020129 has 2 divisors, whose sum is σ = 1121020130. Its totient is φ = 1121020128.

The previous prime is 1121020093. The next prime is 1121020139. The reversal of 1121020129 is 9210201211.

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., 1076824225 + 44195904 = 32815^2 + 6648^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121020129 - 2⁹ = 1121019617 is a prime.

It is a super-2 number, since 2×1121020129² = 2513372259246353282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1121020139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510064 + 560510065.

It is an arithmetic number, because the mean of its divisors is an integer number (560510065).

Almost surely, 2^1121020129 is an apocalyptic number.

It is an amenable number.

1121020129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121020129 is an equidigital number, since it uses as much as digits as its factorization.

1121020129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1121020129 is about 33481.6386845089. The cubic root of 1121020129 is about 1038.8140231323.

The spelling of 1121020129 in words is "one billion, one hundred twenty-one million, twenty thousand, one hundred twenty-nine".