123545509987 has 2 divisors, whose sum is σ = 123545509988. Its totient is φ = 123545509986.

The previous prime is 123545509949. The next prime is 123545510003. The reversal of 123545509987 is 789905545321.

It is a strong prime.

It is an emirp because it is prime and its reverse (789905545321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123545509987 - 2²⁷ = 123411292259 is a prime.

It is not a weakly prime, because it can be changed into another prime (123545519987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61772754993 + 61772754994.

It is an arithmetic number, because the mean of its divisors is an integer number (61772754994).

Almost surely, 2^123545509987 is an apocalyptic number.

123545509987 is a deficient number, since it is larger than the sum of its proper divisors (1).

123545509987 is an equidigital number, since it uses as much as digits as its factorization.

123545509987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608000, while the sum is 58.

The spelling of 123545509987 in words is "one hundred twenty-three billion, five hundred forty-five million, five hundred nine thousand, nine hundred eighty-seven".