123180989 has 2 divisors, whose sum is σ = 123180990. Its totient is φ = 123180988.

The previous prime is 123180943. The next prime is 123181013. The reversal of 123180989 is 989081321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122832889 + 348100 = 11083^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 123180989 - 2¹⁶ = 123115453 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 (123180919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61590494 + 61590495.

It is an arithmetic number, because the mean of its divisors is an integer number (61590495).

Almost surely, 2^123180989 is an apocalyptic number.

It is an amenable number.

123180989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123180989 is an equidigital number, since it uses as much as digits as its factorization.

123180989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 123180989 is about 11098.6931212643. The cubic root of 123180989 is about 497.5627913304.

The spelling of 123180989 in words is "one hundred twenty-three million, one hundred eighty thousand, nine hundred eighty-nine".