123173221 has 2 divisors, whose sum is σ = 123173222. Its totient is φ = 123173220.

The previous prime is 123173209. The next prime is 123173227. The reversal of 123173221 is 122371321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69722500 + 53450721 = 8350^2 + 7311^2 .

It is a cyclic number.

It is not a de Polignac number, because 123173221 - 2⁵ = 123173189 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 123173192 and 123173201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123173227) 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 as a sum of consecutive naturals, namely, 61586610 + 61586611.

It is an arithmetic number, because the mean of its divisors is an integer number (61586611).

Almost surely, 2^123173221 is an apocalyptic number.

It is an amenable number.

123173221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123173221 is an equidigital number, since it uses as much as digits as its factorization.

123173221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 123173221 is about 11098.3431646350. The cubic root of 123173221 is about 497.5523320622.

The spelling of 123173221 in words is "one hundred twenty-three million, one hundred seventy-three thousand, two hundred twenty-one".