172697617 has 4 divisors (see below), whose sum is σ = 176909796. Its totient is φ = 168485440.

The previous prime is 172697597. The next prime is 172697627. The reversal of 172697617 is 716796271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716796271 = 73 ⋅9819127.

It can be written as a sum of positive squares in 2 ways, for example, as 31539456 + 141158161 = 5616^2 + 11881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172697617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172697627) 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, 2106028 + ... + 2106109.

It is an arithmetic number, because the mean of its divisors is an integer number (44227449).

Almost surely, 2^172697617 is an apocalyptic number.

It is an amenable number.

172697617 is a deficient number, since it is larger than the sum of its proper divisors (4212179).

172697617 is an equidigital number, since it uses as much as digits as its factorization.

172697617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212178.

The product of its digits is 222264, while the sum is 46.

The square root of 172697617 is about 13141.4465337725. The cubic root of 172697617 is about 556.8806337198.

The spelling of 172697617 in words is "one hundred seventy-two million, six hundred ninety-seven thousand, six hundred seventeen".