173129399 has 2 divisors, whose sum is σ = 173129400. Its totient is φ = 173129398.

The previous prime is 173129357. The next prime is 173129417. The reversal of 173129399 is 993921371.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 173129399 - 2²⁰ = 172080823 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173129599) 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, 86564699 + 86564700.

It is an arithmetic number, because the mean of its divisors is an integer number (86564700).

Almost surely, 2^173129399 is an apocalyptic number.

173129399 is a deficient number, since it is larger than the sum of its proper divisors (1).

173129399 is an equidigital number, since it uses as much as digits as its factorization.

173129399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 44.

The square root of 173129399 is about 13157.8645303864. The cubic root of 173129399 is about 557.3443554595.

The spelling of 173129399 in words is "one hundred seventy-three million, one hundred twenty-nine thousand, three hundred ninety-nine".