129572873 has 2 divisors, whose sum is σ = 129572874. Its totient is φ = 129572872.

The previous prime is 129572797. The next prime is 129572879. The reversal of 129572873 is 378275921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67289209 + 62283664 = 8203^2 + 7892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129572873 is a prime.

It is not a weakly prime, because it can be changed into another prime (129572879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64786436 + 64786437.

It is an arithmetic number, because the mean of its divisors is an integer number (64786437).

Almost surely, 2^129572873 is an apocalyptic number.

It is an amenable number.

129572873 is a deficient number, since it is larger than the sum of its proper divisors (1).

129572873 is an equidigital number, since it uses as much as digits as its factorization.

129572873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 129572873 is about 11383.0080822250. The cubic root of 129572873 is about 506.0242883872.

The spelling of 129572873 in words is "one hundred twenty-nine million, five hundred seventy-two thousand, eight hundred seventy-three".