172085617 has 4 divisors (see below), whose sum is σ = 187729776. Its totient is φ = 156441460.

The previous prime is 172085597. The next prime is 172085629. The reversal of 172085617 is 716580271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172085617 - 2¹⁹ = 171561329 is a prime.

It is a super-2 number, since 2×172085617² = 59226919156541378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172085657) 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, 7822063 + ... + 7822084.

It is an arithmetic number, because the mean of its divisors is an integer number (46932444).

Almost surely, 2^172085617 is an apocalyptic number.

It is an amenable number.

172085617 is a deficient number, since it is larger than the sum of its proper divisors (15644159).

172085617 is a wasteful number, since it uses less digits than its factorization.

172085617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15644158.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 172085617 is about 13118.1407600315. The cubic root of 172085617 is about 556.2220368555. Note that the first 3 decimals are identical.

The spelling of 172085617 in words is "one hundred seventy-two million, eighty-five thousand, six hundred seventeen".