123155173 has 2 divisors, whose sum is σ = 123155174. Its totient is φ = 123155172.

The previous prime is 123155167. The next prime is 123155183. The reversal of 123155173 is 371551321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119399329 + 3755844 = 10927^2 + 1938^2 .

It is an emirp because it is prime and its reverse (371551321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123155173 is a prime.

It is equal to p_7010992 and since 123155173 and 7010992 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123155113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61577586 + 61577587.

It is an arithmetic number, because the mean of its divisors is an integer number (61577587).

Almost surely, 2^123155173 is an apocalyptic number.

It is an amenable number.

123155173 is a deficient number, since it is larger than the sum of its proper divisors (1).

123155173 is an equidigital number, since it uses as much as digits as its factorization.

123155173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 28.

The square root of 123155173 is about 11097.5300405090. The cubic root of 123155173 is about 497.5280295311.

The spelling of 123155173 in words is "one hundred twenty-three million, one hundred fifty-five thousand, one hundred seventy-three".