173220971 has 16 divisors (see below), whose sum is σ = 218070528. Its totient is φ = 133660800.

The previous prime is 173220937. The next prime is 173220979. The reversal of 173220971 is 179022371.

It is not a de Polignac number, because 173220971 - 2¹⁰ = 173219947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173220979) 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 15 ways as a sum of consecutive naturals, for example, 2990 + ... + 18851.

It is an arithmetic number, because the mean of its divisors is an integer number (13629408).

Almost surely, 2^173220971 is an apocalyptic number.

173220971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

173220971 is a deficient number, since it is larger than the sum of its proper divisors (44849557).

173220971 is a wasteful number, since it uses less digits than its factorization.

173220971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21962.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 173220971 is about 13161.3438143679. The cubic root of 173220971 is about 557.4426020928.

The spelling of 173220971 in words is "one hundred seventy-three million, two hundred twenty thousand, nine hundred seventy-one".