172117281 has 8 divisors (see below), whose sum is σ = 262273984. Its totient is φ = 98352720.

The previous prime is 172117273. The next prime is 172117307. The reversal of 172117281 is 182711271.

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

It is not a de Polignac number, because 172117281 - 2³ = 172117273 is a prime.

It is a super-2 number, since 2×172117281² = 59248716837665922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172117241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4098010 + ... + 4098051.

It is an arithmetic number, because the mean of its divisors is an integer number (32784248).

Almost surely, 2^172117281 is an apocalyptic number.

It is an amenable number.

172117281 is a deficient number, since it is larger than the sum of its proper divisors (90156703).

172117281 is an equidigital number, since it uses as much as digits as its factorization.

172117281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8196071.

The product of its digits is 1568, while the sum is 30.

The square root of 172117281 is about 13119.3475828640. The cubic root of 172117281 is about 556.2561499804.

The spelling of 172117281 in words is "one hundred seventy-two million, one hundred seventeen thousand, two hundred eighty-one".