129199851 has 24 divisors (see below), whose sum is σ = 207926784. Its totient is φ = 76634160.

The previous prime is 129199823. The next prime is 129199871. The reversal of 129199851 is 158991921.

It is not a de Polignac number, because 129199851 - 2²¹ = 127102699 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 129199797 and 129199806.

It is not an unprimeable number, because it can be changed into a prime (129199871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9231 + ... + 18536.

It is an arithmetic number, because the mean of its divisors is an integer number (8663616).

Almost surely, 2^129199851 is an apocalyptic number.

129199851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129199851 is a deficient number, since it is larger than the sum of its proper divisors (78726933).

129199851 is a wasteful number, since it uses less digits than its factorization.

129199851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27831 (or 27828 counting only the distinct ones).

The product of its digits is 58320, while the sum is 45.

The square root of 129199851 is about 11366.6112364240. The cubic root of 129199851 is about 505.5382308402.

The spelling of 129199851 in words is "one hundred twenty-nine million, one hundred ninety-nine thousand, eight hundred fifty-one".