172005109 has 8 divisors (see below), whose sum is σ = 179642880. Its totient is φ = 164380656.

The previous prime is 172005103. The next prime is 172005131. The reversal of 172005109 is 901500271.

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 172005109 - 2¹³ = 171996917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172005103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30499 + ... + 35695.

It is an arithmetic number, because the mean of its divisors is an integer number (22455360).

Almost surely, 2^172005109 is an apocalyptic number.

It is an amenable number.

172005109 is a deficient number, since it is larger than the sum of its proper divisors (7637771).

172005109 is a wasteful number, since it uses less digits than its factorization.

172005109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6659.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 172005109 is about 13115.0718259566. The cubic root of 172005109 is about 556.1352829291.

The spelling of 172005109 in words is "one hundred seventy-two million, five thousand, one hundred nine".