123100509 has 8 divisors (see below), whose sum is σ = 187581760. Its totient is φ = 70343136.

The previous prime is 123100499. The next prime is 123100559. The reversal of 123100509 is 905001321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123100509 - 2⁴ = 123100493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5861929 = 123100509 / (1 + 2 + 3 + 1 + 0 + 0 + 5 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123100559) 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 7 ways as a sum of consecutive naturals, for example, 2930944 + ... + 2930985.

It is an arithmetic number, because the mean of its divisors is an integer number (23447720).

Almost surely, 2^123100509 is an apocalyptic number.

It is an amenable number.

123100509 is a deficient number, since it is larger than the sum of its proper divisors (64481251).

123100509 is an equidigital number, since it uses as much as digits as its factorization.

123100509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5861939.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 123100509 is about 11095.0668767701. The cubic root of 123100509 is about 497.4544072424.

The spelling of 123100509 in words is "one hundred twenty-three million, one hundred thousand, five hundred nine".