129185951 has 2 divisors, whose sum is σ = 129185952. Its totient is φ = 129185950.

The previous prime is 129185929. The next prime is 129185977. The reversal of 129185951 is 159581921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129185951 - 2¹⁰ = 129184927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129185899 and 129185908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129181951) 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, 64592975 + 64592976.

It is an arithmetic number, because the mean of its divisors is an integer number (64592976).

Almost surely, 2^129185951 is an apocalyptic number.

129185951 is a deficient number, since it is larger than the sum of its proper divisors (1).

129185951 is an equidigital number, since it uses as much as digits as its factorization.

129185951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 41.

The square root of 129185951 is about 11365.9997800457. Note that the first 3 decimals coincide. The cubic root of 129185951 is about 505.5201007021.

The spelling of 129185951 in words is "one hundred twenty-nine million, one hundred eighty-five thousand, nine hundred fifty-one".