172805129 has 8 divisors (see below), whose sum is σ = 203862528. Its totient is φ = 143340480.

The previous prime is 172805117. The next prime is 172805161. The reversal of 172805129 is 921508271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172805129 - 2¹² = 172801033 is a prime.

It is a super-2 number, since 2×172805129² = 59723225217413282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172805329) 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 in 7 ways as a sum of consecutive naturals, for example, 397952 + ... + 398385.

It is an arithmetic number, because the mean of its divisors is an integer number (25482816).

Almost surely, 2^172805129 is an apocalyptic number.

It is an amenable number.

172805129 is a deficient number, since it is larger than the sum of its proper divisors (31057399).

172805129 is an equidigital number, since it uses as much as digits as its factorization.

172805129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796375.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 172805129 is about 13145.5364668012. The cubic root of 172805129 is about 556.9961707913.

The spelling of 172805129 in words is "one hundred seventy-two million, eight hundred five thousand, one hundred twenty-nine".