172166187 has 16 divisors (see below), whose sum is σ = 231478560. Its totient is φ = 113820672.

The previous prime is 172166177. The next prime is 172166209. The reversal of 172166187 is 781661271.

It is not a de Polignac number, because 172166187 - 2¹² = 172162091 is a prime.

It is a super-2 number, since 2×172166187² = 59282391892237938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172166117) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 255483 + ... + 256155.

It is an arithmetic number, because the mean of its divisors is an integer number (14467410).

Almost surely, 2^172166187 is an apocalyptic number.

172166187 is a deficient number, since it is larger than the sum of its proper divisors (59312373).

172166187 is a wasteful number, since it uses less digits than its factorization.

172166187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262.

The product of its digits is 28224, while the sum is 39.

The square root of 172166187 is about 13121.2113388970. The cubic root of 172166187 is about 556.3088305071.

The spelling of 172166187 in words is "one hundred seventy-two million, one hundred sixty-six thousand, one hundred eighty-seven".