172001617 has 4 divisors (see below), whose sum is σ = 172996020. Its totient is φ = 171007216.

The previous prime is 172001611. The next prime is 172001633. The reversal of 172001617 is 716100271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118287376 + 53714241 = 10876^2 + 7329^2 .

It is a cyclic number.

It is not a de Polignac number, because 172001617 - 2¹⁹ = 171477329 is a prime.

It is a super-2 number, since 2×172001617² = 59169112501229378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172001591 and 172001600.

It is not an unprimeable number, because it can be changed into a prime (172001611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496942 + ... + 497287.

It is an arithmetic number, because the mean of its divisors is an integer number (43249005).

Almost surely, 2^172001617 is an apocalyptic number.

It is an amenable number.

172001617 is a deficient number, since it is larger than the sum of its proper divisors (994403).

172001617 is an equidigital number, since it uses as much as digits as its factorization.

172001617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994402.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 172001617 is about 13114.9386960062. The cubic root of 172001617 is about 556.1315194022.

Adding to 172001617 its reverse (716100271), we get a palindrome (888101888).

The spelling of 172001617 in words is "one hundred seventy-two million, one thousand, six hundred seventeen".