172156117 has 8 divisors (see below), whose sum is σ = 197243712. Its totient is φ = 147192000.

The previous prime is 172156111. The next prime is 172156121. The reversal of 172156117 is 711651271.

It is a happy number.

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 172156117 - 2³ = 172156109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172156111) 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, 27859 + ... + 33472.

It is an arithmetic number, because the mean of its divisors is an integer number (24655464).

Almost surely, 2^172156117 is an apocalyptic number.

It is an amenable number.

172156117 is a deficient number, since it is larger than the sum of its proper divisors (25087595).

172156117 is an equidigital number, since it uses as much as digits as its factorization.

172156117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61739.

The product of its digits is 2940, while the sum is 31.

The square root of 172156117 is about 13120.8276034708. The cubic root of 172156117 is about 556.2979841281.

It can be divided in two parts, 17215 and 6117, that added together give a palindrome (23332).

The spelling of 172156117 in words is "one hundred seventy-two million, one hundred fifty-six thousand, one hundred seventeen".