123945187 has 2 divisors, whose sum is σ = 123945188. Its totient is φ = 123945186.

The previous prime is 123945163. The next prime is 123945191. The reversal of 123945187 is 781549321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123945187 - 2¹¹ = 123943139 is a prime.

It is not a weakly prime, because it can be changed into another prime (123945127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61972593 + 61972594.

It is an arithmetic number, because the mean of its divisors is an integer number (61972594).

Almost surely, 2^123945187 is an apocalyptic number.

123945187 is a deficient number, since it is larger than the sum of its proper divisors (1).

123945187 is an equidigital number, since it uses as much as digits as its factorization.

123945187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 123945187 is about 11133.0672772601. The cubic root of 123945187 is about 498.5896079962.

The spelling of 123945187 in words is "one hundred twenty-three million, nine hundred forty-five thousand, one hundred eighty-seven".