2117912129 has 2 divisors, whose sum is σ = 2117912130. Its totient is φ = 2117912128.

The previous prime is 2117912087. The next prime is 2117912141. The reversal of 2117912129 is 9212197112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1966745104 + 151167025 = 44348^2 + 12295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117912129 - 2¹² = 2117908033 is a prime.

It is not a weakly prime, because it can be changed into another prime (2117912149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058956064 + 1058956065.

It is an arithmetic number, because the mean of its divisors is an integer number (1058956065).

Almost surely, 2^2117912129 is an apocalyptic number.

It is an amenable number.

2117912129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117912129 is an equidigital number, since it uses as much as digits as its factorization.

2117912129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 35.

The square root of 2117912129 is about 46020.7793176083. The cubic root of 2117912129 is about 1284.2097982526.

The spelling of 2117912129 in words is "two billion, one hundred seventeen million, nine hundred twelve thousand, one hundred twenty-nine".