123161189 has 2 divisors, whose sum is σ = 123161190. Its totient is φ = 123161188.

The previous prime is 123161179. The next prime is 123161239. The reversal of 123161189 is 981161321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119028100 + 4133089 = 10910^2 + 2033^2 .

It is a cyclic number.

It is not a de Polignac number, because 123161189 - 2¹² = 123157093 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123161119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61580594 + 61580595.

It is an arithmetic number, because the mean of its divisors is an integer number (61580595).

Almost surely, 2^123161189 is an apocalyptic number.

It is an amenable number.

123161189 is a deficient number, since it is larger than the sum of its proper divisors (1).

123161189 is an equidigital number, since it uses as much as digits as its factorization.

123161189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 123161189 is about 11097.8010885040. The cubic root of 123161189 is about 497.5361306386.

The spelling of 123161189 in words is "one hundred twenty-three million, one hundred sixty-one thousand, one hundred eighty-nine".