172108345 has 4 divisors (see below), whose sum is σ = 206530020. Its totient is φ = 137686672.

The previous prime is 172108291. The next prime is 172108351. The reversal of 172108345 is 543801271.

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 108555561 + 63552784 = 10419^2 + 7972^2 .

It is a cyclic number.

It is not a de Polignac number, because 172108345 - 2⁷ = 172108217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17210830 + ... + 17210839.

It is an arithmetic number, because the mean of its divisors is an integer number (51632505).

Almost surely, 2^172108345 is an apocalyptic number.

It is an amenable number.

172108345 is a deficient number, since it is larger than the sum of its proper divisors (34421675).

172108345 is an equidigital number, since it uses as much as digits as its factorization.

172108345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34421674.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 172108345 is about 13119.0070127278. The cubic root of 172108345 is about 556.2465232287.

The spelling of 172108345 in words is "one hundred seventy-two million, one hundred eight thousand, three hundred forty-five".