129431473 has 2 divisors, whose sum is σ = 129431474. Its totient is φ = 129431472.

The previous prime is 129431461. The next prime is 129431483. The reversal of 129431473 is 374134921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129208689 + 222784 = 11367^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 129431473 - 2⁵ = 129431441 is a prime.

It is not a weakly prime, because it can be changed into another prime (129431453) 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 as a sum of consecutive naturals, namely, 64715736 + 64715737.

It is an arithmetic number, because the mean of its divisors is an integer number (64715737).

Almost surely, 2^129431473 is an apocalyptic number.

It is an amenable number.

129431473 is a deficient number, since it is larger than the sum of its proper divisors (1).

129431473 is an equidigital number, since it uses as much as digits as its factorization.

129431473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 129431473 is about 11376.7953747969. The cubic root of 129431473 is about 505.8401503647.

The spelling of 129431473 in words is "one hundred twenty-nine million, four hundred thirty-one thousand, four hundred seventy-three".