172848989 has 4 divisors (see below), whose sum is σ = 177064860. Its totient is φ = 168633120.

The previous prime is 172848983. The next prime is 172848997. The reversal of 172848989 is 989848271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989848271 = 29 ⋅34132699.

It can be written as a sum of positive squares in 2 ways, for example, as 18344089 + 154504900 = 4283^2 + 12430^2 .

It is a cyclic number.

It is not a de Polignac number, because 172848989 - 2⁸ = 172848733 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 (172848983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107874 + ... + 2107955.

It is an arithmetic number, because the mean of its divisors is an integer number (44266215).

Almost surely, 2^172848989 is an apocalyptic number.

It is an amenable number.

172848989 is a deficient number, since it is larger than the sum of its proper divisors (4215871).

172848989 is an equidigital number, since it uses as much as digits as its factorization.

172848989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215870.

The product of its digits is 2322432, while the sum is 56.

The square root of 172848989 is about 13147.2046078244. The cubic root of 172848989 is about 557.0432908925.

The spelling of 172848989 in words is "one hundred seventy-two million, eight hundred forty-eight thousand, nine hundred eighty-nine".