129869251 has 2 divisors, whose sum is σ = 129869252. Its totient is φ = 129869250.

The previous prime is 129869231. The next prime is 129869281. The reversal of 129869251 is 152968921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129869251 - 2⁵ = 129869219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129869198 and 129869207.

It is not a weakly prime, because it can be changed into another prime (129869231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64934625 + 64934626.

It is an arithmetic number, because the mean of its divisors is an integer number (64934626).

Almost surely, 2^129869251 is an apocalyptic number.

129869251 is a deficient number, since it is larger than the sum of its proper divisors (1).

129869251 is an equidigital number, since it uses as much as digits as its factorization.

129869251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 129869251 is about 11396.0190856281. The cubic root of 129869251 is about 506.4098121477.

The spelling of 129869251 in words is "one hundred twenty-nine million, eight hundred sixty-nine thousand, two hundred fifty-one".