1211110129 has 2 divisors, whose sum is σ = 1211110130. Its totient is φ = 1211110128.

The previous prime is 1211110091. The next prime is 1211110183. The reversal of 1211110129 is 9210111121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140885729 + 70224400 = 33777^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211110129 - 2²⁵ = 1177555697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211110189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605555064 + 605555065.

It is an arithmetic number, because the mean of its divisors is an integer number (605555065).

Almost surely, 2^1211110129 is an apocalyptic number.

It is an amenable number.

1211110129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211110129 is an equidigital number, since it uses as much as digits as its factorization.

1211110129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

The square root of 1211110129 is about 34801.0075859881. The cubic root of 1211110129 is about 1065.9280203361.

The spelling of 1211110129 in words is "one billion, two hundred eleven million, one hundred ten thousand, one hundred twenty-nine".