124002509 has 2 divisors, whose sum is σ = 124002510. Its totient is φ = 124002508.

The previous prime is 124002481. The next prime is 124002517. The reversal of 124002509 is 905200421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88266025 + 35736484 = 9395^2 + 5978^2 .

It is a cyclic number.

It is not a de Polignac number, because 124002509 - 2²⁰ = 122953933 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124002589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62001254 + 62001255.

It is an arithmetic number, because the mean of its divisors is an integer number (62001255).

Almost surely, 2^124002509 is an apocalyptic number.

It is an amenable number.

124002509 is a deficient number, since it is larger than the sum of its proper divisors (1).

124002509 is an equidigital number, since it uses as much as digits as its factorization.

124002509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 124002509 is about 11135.6413825159. The cubic root of 124002509 is about 498.6664584961. Note that the first 3 decimals are identical.

The spelling of 124002509 in words is "one hundred twenty-four million, two thousand, five hundred nine".