213173 has 2 divisors, whose sum is σ = 213174. Its totient is φ = 213172.

The previous prime is 213149. The next prime is 213181. The reversal of 213173 is 371312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 47524 = 407^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 213173 - 2⁸ = 212917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106586 + 106587.

It is an arithmetic number, because the mean of its divisors is an integer number (106587).

2²¹³¹⁷³ is an apocalyptic number.

It is an amenable number.

213173 is a deficient number, since it is larger than the sum of its proper divisors (1).

213173 is an equidigital number, since it uses as much as digits as its factorization.

213173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 17.

The square root of 213173 is about 461.7066168034. The cubic root of 213173 is about 59.7370903991.

Adding to 213173 its reverse (371312), we get a palindrome (584485).

The spelling of 213173 in words is "two hundred thirteen thousand, one hundred seventy-three".