123500009 has 6 divisors (see below), whose sum is σ = 127906350. Its totient is φ = 119240576.

The previous prime is 123499993. The next prime is 123500011. The reversal of 123500009 is 900005321.

It can be written as a sum of positive squares in 3 ways, for example, as 3115225 + 120384784 = 1765^2 + 10972^2 .

It is not a de Polignac number, because 123500009 - 2⁴ = 123499993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123500059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72584 + ... + 74265.

It is an arithmetic number, because the mean of its divisors is an integer number (21317725).

Almost surely, 2^123500009 is an apocalyptic number.

It is an amenable number.

123500009 is a deficient number, since it is larger than the sum of its proper divisors (4406341).

123500009 is an equidigital number, since it uses as much as digits as its factorization.

123500009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146907 (or 146878 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 123500009 is about 11113.0557903756. The cubic root of 123500009 is about 497.9919583332.

The spelling of 123500009 in words is "one hundred twenty-three million, five hundred thousand, nine".