172245187 has 2 divisors, whose sum is σ = 172245188. Its totient is φ = 172245186.

The previous prime is 172245133. The next prime is 172245193. The reversal of 172245187 is 781542271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172245187 - 2²³ = 163856579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172245107) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86122593 + 86122594.

It is an arithmetic number, because the mean of its divisors is an integer number (86122594).

Almost surely, 2^172245187 is an apocalyptic number.

172245187 is a deficient number, since it is larger than the sum of its proper divisors (1).

172245187 is an equidigital number, since it uses as much as digits as its factorization.

172245187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 37.

The square root of 172245187 is about 13124.2213864290. The cubic root of 172245187 is about 556.3939065956.

The spelling of 172245187 in words is "one hundred seventy-two million, two hundred forty-five thousand, one hundred eighty-seven".