172145206 has 16 divisors (see below), whose sum is σ = 272113200. Its totient is φ = 81451008.

The previous prime is 172145203. The next prime is 172145209. The reversal of 172145206 is 602541271.

It is an interprime number because it is at equal distance from previous prime (172145203) and next prime (172145209).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172145203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41850 + ... + 45778.

It is an arithmetic number, because the mean of its divisors is an integer number (17007075).

Almost surely, 2^172145206 is an apocalyptic number.

172145206 is a deficient number, since it is larger than the sum of its proper divisors (99967994).

172145206 is a wasteful number, since it uses less digits than its factorization.

172145206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 172145206 is about 13120.4118075615. The cubic root of 172145206 is about 556.2862314320.

Adding to 172145206 its reverse (602541271), we get a palindrome (774686477).

The spelling of 172145206 in words is "one hundred seventy-two million, one hundred forty-five thousand, two hundred six".