129417121 has 2 divisors, whose sum is σ = 129417122. Its totient is φ = 129417120.

The previous prime is 129417091. The next prime is 129417139. The reversal of 129417121 is 121714921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118026496 + 11390625 = 10864^2 + 3375^2 .

It is a cyclic number.

It is not a de Polignac number, because 129417121 - 2⁷ = 129416993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129417121.

It is not a weakly prime, because it can be changed into another prime (129417181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64708560 + 64708561.

It is an arithmetic number, because the mean of its divisors is an integer number (64708561).

Almost surely, 2^129417121 is an apocalyptic number.

It is an amenable number.

129417121 is a deficient number, since it is larger than the sum of its proper divisors (1).

129417121 is an equidigital number, since it uses as much as digits as its factorization.

129417121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 28.

The square root of 129417121 is about 11376.1645997234. The cubic root of 129417121 is about 505.8214529901.

The spelling of 129417121 in words is "one hundred twenty-nine million, four hundred seventeen thousand, one hundred twenty-one".