172021589 has 8 divisors (see below), whose sum is σ = 182399040. Its totient is φ = 161672896.

The previous prime is 172021579. The next prime is 172021601. The reversal of 172021589 is 985120271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172021589 - 2¹² = 172017493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172021519) 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 7 ways as a sum of consecutive naturals, for example, 5822 + ... + 19440.

It is an arithmetic number, because the mean of its divisors is an integer number (22799880).

Almost surely, 2^172021589 is an apocalyptic number.

It is an amenable number.

172021589 is a deficient number, since it is larger than the sum of its proper divisors (10377451).

172021589 is a wasteful number, since it uses less digits than its factorization.

172021589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14379.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 172021589 is about 13115.7000956868. The cubic root of 172021589 is about 556.1530436743.

The spelling of 172021589 in words is "one hundred seventy-two million, twenty-one thousand, five hundred eighty-nine".