172145203 has 2 divisors, whose sum is σ = 172145204. Its totient is φ = 172145202.

The previous prime is 172145191. The next prime is 172145209. The reversal of 172145203 is 302541271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172145203 is a prime.

It is a super-2 number, since 2×172145203² = 59267941831822418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172145209) 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 as a sum of consecutive naturals, namely, 86072601 + 86072602.

It is an arithmetic number, because the mean of its divisors is an integer number (86072602).

Almost surely, 2^172145203 is an apocalyptic number.

172145203 is a deficient number, since it is larger than the sum of its proper divisors (1).

172145203 is an equidigital number, since it uses as much as digits as its factorization.

172145203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 172145203 is about 13120.4116932358. The cubic root of 172145203 is about 556.2862282005.

Adding to 172145203 its reverse (302541271), we get a palindrome (474686474).

The spelling of 172145203 in words is "one hundred seventy-two million, one hundred forty-five thousand, two hundred three".