123173489 has 2 divisors, whose sum is σ = 123173490. Its totient is φ = 123173488.

The previous prime is 123173461. The next prime is 123173497. The reversal of 123173489 is 984371321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 59413264 = 7985^2 + 7708^2 .

It is an emirp because it is prime and its reverse (984371321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123173489 is a prime.

It is not a weakly prime, because it can be changed into another prime (123173459) 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, 61586744 + 61586745.

It is an arithmetic number, because the mean of its divisors is an integer number (61586745).

Almost surely, 2^123173489 is an apocalyptic number.

It is an amenable number.

123173489 is a deficient number, since it is larger than the sum of its proper divisors (1).

123173489 is an equidigital number, since it uses as much as digits as its factorization.

123173489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 123173489 is about 11098.3552385027. The cubic root of 123173489 is about 497.5526929197.

The spelling of 123173489 in words is "one hundred twenty-three million, one hundred seventy-three thousand, four hundred eighty-nine".