13220173 has 4 divisors (see below), whose sum is σ = 13259740. Its totient is φ = 13180608.

The previous prime is 13220131. The next prime is 13220177. The reversal of 13220173 is 37102231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9753129 + 3467044 = 3123^2 + 1862^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220173 - 2¹⁷ = 13089101 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 13220173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220177) 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 3 ways as a sum of consecutive naturals, for example, 19278 + ... + 19951.

It is an arithmetic number, because the mean of its divisors is an integer number (3314935).

Almost surely, 2^13220173 is an apocalyptic number.

13220173 is the 1944-th centered heptagonal number.

It is an amenable number.

13220173 is a deficient number, since it is larger than the sum of its proper divisors (39567).

13220173 is an equidigital number, since it uses as much as digits as its factorization.

13220173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39566.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 13220173 is about 3635.9555827870. The cubic root of 13220173 is about 236.4534814575.

The spelling of 13220173 in words is "thirteen million, two hundred twenty thousand, one hundred seventy-three".