172649317 has 4 divisors (see below), whose sum is σ = 172683820. Its totient is φ = 172614816.

The previous prime is 172649287. The next prime is 172649341. The reversal of 172649317 is 713946271.

172649317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713946271 = 151 ⋅4728121.

It can be written as a sum of positive squares in 2 ways, for example, as 112911876 + 59737441 = 10626^2 + 7729^2 .

It is a cyclic number.

It is not a de Polignac number, because 172649317 - 2¹⁹ = 172125029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172649317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172649387) 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, 8142 + ... + 20287.

It is an arithmetic number, because the mean of its divisors is an integer number (43170955).

Almost surely, 2^172649317 is an apocalyptic number.

It is an amenable number.

172649317 is a deficient number, since it is larger than the sum of its proper divisors (34503).

172649317 is an equidigital number, since it uses as much as digits as its factorization.

172649317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34502.

The product of its digits is 63504, while the sum is 40.

The square root of 172649317 is about 13139.6087080248. The cubic root of 172649317 is about 556.8287128286.

The spelling of 172649317 in words is "one hundred seventy-two million, six hundred forty-nine thousand, three hundred seventeen".