172317055 has 8 divisors (see below), whose sum is σ = 211824144. Its totient is φ = 134491200.

The previous prime is 172316999. The next prime is 172317059. The reversal of 172317055 is 550713271.

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

It is not a de Polignac number, because 172317055 - 2¹⁷ = 172185983 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 (172317059) 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, 420081 + ... + 420490.

It is an arithmetic number, because the mean of its divisors is an integer number (26478018).

Almost surely, 2^172317055 is an apocalyptic number.

172317055 is a deficient number, since it is larger than the sum of its proper divisors (39507089).

172317055 is an equidigital number, since it uses as much as digits as its factorization.

172317055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840617.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 172317055 is about 13126.9590918842. The cubic root of 172317055 is about 556.4712795503.

The spelling of 172317055 in words is "one hundred seventy-two million, three hundred seventeen thousand, fifty-five".