123945578189 has 2 divisors, whose sum is σ = 123945578190. Its totient is φ = 123945578188.

The previous prime is 123945578077. The next prime is 123945578249. The reversal of 123945578189 is 981875549321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88130015689 + 35815562500 = 296867^2 + 189250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123945578189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123942578189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61972789094 + 61972789095.

It is an arithmetic number, because the mean of its divisors is an integer number (61972789095).

Almost surely, 2^123945578189 is an apocalyptic number.

It is an amenable number.

123945578189 is a deficient number, since it is larger than the sum of its proper divisors (1).

123945578189 is an equidigital number, since it uses as much as digits as its factorization.

123945578189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21772800, while the sum is 62.

The spelling of 123945578189 in words is "one hundred twenty-three billion, nine hundred forty-five million, five hundred seventy-eight thousand, one hundred eighty-nine".