129785099 has 2 divisors, whose sum is σ = 129785100. Its totient is φ = 129785098.

The previous prime is 129785083. The next prime is 129785129. The reversal of 129785099 is 990587921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129785099 - 2⁴ = 129785083 is a prime.

It is not a weakly prime, because it can be changed into another prime (129785009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64892549 + 64892550.

It is an arithmetic number, because the mean of its divisors is an integer number (64892550).

Almost surely, 2^129785099 is an apocalyptic number.

129785099 is a deficient number, since it is larger than the sum of its proper divisors (1).

129785099 is an equidigital number, since it uses as much as digits as its factorization.

129785099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 129785099 is about 11392.3263208179. The cubic root of 129785099 is about 506.3004082509.

The spelling of 129785099 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, ninety-nine".