129427099 has 2 divisors, whose sum is σ = 129427100. Its totient is φ = 129427098.

The previous prime is 129427079. The next prime is 129427159. The reversal of 129427099 is 990724921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129427099 - 2²¹ = 127329947 is a prime.

It is not a weakly prime, because it can be changed into another prime (129427079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64713549 + 64713550.

It is an arithmetic number, because the mean of its divisors is an integer number (64713550).

Almost surely, 2^129427099 is an apocalyptic number.

129427099 is a deficient number, since it is larger than the sum of its proper divisors (1).

129427099 is an equidigital number, since it uses as much as digits as its factorization.

129427099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 129427099 is about 11376.6031397777. The cubic root of 129427099 is about 505.8344521892.

The spelling of 129427099 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, ninety-nine".