172186157 has 12 divisors (see below), whose sum is σ = 203402304. Its totient is φ = 144490320.

The previous prime is 172186153. The next prime is 172186159. The reversal of 172186157 is 751681271.

It is a happy number.

It is not a de Polignac number, because 172186157 - 2² = 172186153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172186157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172186153) 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 11 ways as a sum of consecutive naturals, for example, 44453 + ... + 48170.

It is an arithmetic number, because the mean of its divisors is an integer number (16950192).

Almost surely, 2^172186157 is an apocalyptic number.

It is an amenable number.

172186157 is a deficient number, since it is larger than the sum of its proper divisors (31216147).

172186157 is a wasteful number, since it uses less digits than its factorization.

172186157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92660 (or 92647 counting only the distinct ones).

The product of its digits is 23520, while the sum is 38.

The square root of 172186157 is about 13121.9722984009. The cubic root of 172186157 is about 556.3303389074.

It can be divided in two parts, 1721 and 86157, that added together give a palindrome (87878).

The spelling of 172186157 in words is "one hundred seventy-two million, one hundred eighty-six thousand, one hundred fifty-seven".