129200011 has 2 divisors, whose sum is σ = 129200012. Its totient is φ = 129200010.

The previous prime is 129200009. The next prime is 129200047. The reversal of 129200011 is 110002921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129200011 - 2¹ = 129200009 is a prime.

Together with 129200009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129200081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64600005 + 64600006.

It is an arithmetic number, because the mean of its divisors is an integer number (64600006).

Almost surely, 2^129200011 is an apocalyptic number.

129200011 is a deficient number, since it is larger than the sum of its proper divisors (1).

129200011 is an equidigital number, since it uses as much as digits as its factorization.

129200011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 129200011 is about 11366.6182745793. The cubic root of 129200011 is about 505.5384395248.

Adding to 129200011 its reverse (110002921), we get a palindrome (239202932).

The spelling of 129200011 in words is "one hundred twenty-nine million, two hundred thousand, eleven".