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172170239 = 1553110863
BaseRepresentation
bin10100100001100…
…01101111111111
3102222222011011112
422100301233333
5323033421424
625030112235
74160265023
oct1220615777
9388864145
10172170239
118920505a
12497ab67b
13298920a7
1418c1a383
15101ad60e
hexa431bff

172170239 has 4 divisors (see below), whose sum is σ = 172282656. Its totient is φ = 172057824.

The previous prime is 172170227. The next prime is 172170263. The reversal of 172170239 is 932071271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-172170239 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 (172170269) 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 in 3 ways as a sum of consecutive naturals, for example, 53879 + ... + 56984.

It is an arithmetic number, because the mean of its divisors is an integer number (43070664).

Almost surely, 2172170239 is an apocalyptic number.

172170239 is a deficient number, since it is larger than the sum of its proper divisors (112417).

172170239 is a wasteful number, since it uses less digits than its factorization.

172170239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112416.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 172170239 is about 13121.3657444643. The cubic root of 172170239 is about 556.3131947897.

The spelling of 172170239 in words is "one hundred seventy-two million, one hundred seventy thousand, two hundred thirty-nine".

Divisors: 1 1553 110863 172170239