172009011 has 8 divisors (see below), whose sum is σ = 229500160. Its totient is φ = 114595272.

The previous prime is 172009003. The next prime is 172009021. The reversal of 172009011 is 110900271.

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

It is not a de Polignac number, because 172009011 - 2³ = 172009003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172009021) 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, 13951 + ... + 23208.

It is an arithmetic number, because the mean of its divisors is an integer number (28687520).

Almost surely, 2^172009011 is an apocalyptic number.

172009011 is a deficient number, since it is larger than the sum of its proper divisors (57491149).

172009011 is a wasteful number, since it uses less digits than its factorization.

172009011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38705.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 172009011 is about 13115.2205852589. The cubic root of 172009011 is about 556.1394882760.

Adding to 172009011 its reverse (110900271), we get a palindrome (282909282).

The spelling of 172009011 in words is "one hundred seventy-two million, nine thousand, eleven".