172199989 has 4 divisors (see below), whose sum is σ = 185446156. Its totient is φ = 158953824.

The previous prime is 172199981. The next prime is 172200019. The reversal of 172199989 is 989991271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989991271 = 24469 ⋅40459.

It can be written as a sum of positive squares in 2 ways, for example, as 41280625 + 130919364 = 6425^2 + 11442^2 .

It is a cyclic number.

It is not a de Polignac number, because 172199989 - 2³ = 172199981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172199981) 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 3 ways as a sum of consecutive naturals, for example, 6623064 + ... + 6623089.

It is an arithmetic number, because the mean of its divisors is an integer number (46361539).

Almost surely, 2^172199989 is an apocalyptic number.

It is an amenable number.

172199989 is a deficient number, since it is larger than the sum of its proper divisors (13246167).

172199989 is a wasteful number, since it uses less digits than its factorization.

172199989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13246166.

The product of its digits is 734832, while the sum is 55.

The square root of 172199989 is about 13122.4993427319. The cubic root of 172199989 is about 556.3452354886.

The spelling of 172199989 in words is "one hundred seventy-two million, one hundred ninety-nine thousand, nine hundred eighty-nine".