123704509 has 2 divisors, whose sum is σ = 123704510. Its totient is φ = 123704508.

The previous prime is 123704501. The next prime is 123704527. The reversal of 123704509 is 905407321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123698884 + 5625 = 11122^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 123704509 - 2³ = 123704501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123704501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61852254 + 61852255.

It is an arithmetic number, because the mean of its divisors is an integer number (61852255).

Almost surely, 2^123704509 is an apocalyptic number.

It is an amenable number.

123704509 is a deficient number, since it is larger than the sum of its proper divisors (1).

123704509 is an equidigital number, since it uses as much as digits as its factorization.

123704509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 123704509 is about 11122.2528743056. The cubic root of 123704509 is about 498.2666767915.

The spelling of 123704509 in words is "one hundred twenty-three million, seven hundred four thousand, five hundred nine".