129474809 has 2 divisors, whose sum is σ = 129474810. Its totient is φ = 129474808.

The previous prime is 129474791. The next prime is 129474823. The reversal of 129474809 is 908474921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84584809 + 44890000 = 9197^2 + 6700^2 .

It is a cyclic number.

It is not a de Polignac number, because 129474809 - 2¹² = 129470713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129474809.

It is not a weakly prime, because it can be changed into another prime (129474859) 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, 64737404 + 64737405.

It is an arithmetic number, because the mean of its divisors is an integer number (64737405).

Almost surely, 2^129474809 is an apocalyptic number.

It is an amenable number.

129474809 is a deficient number, since it is larger than the sum of its proper divisors (1).

129474809 is an equidigital number, since it uses as much as digits as its factorization.

129474809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 129474809 is about 11378.6997939132. The cubic root of 129474809 is about 505.8965988780.

The spelling of 129474809 in words is "one hundred twenty-nine million, four hundred seventy-four thousand, eight hundred nine".