123243539 has 2 divisors, whose sum is σ = 123243540. Its totient is φ = 123243538.

The previous prime is 123243529. The next prime is 123243613. The reversal of 123243539 is 935342321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123243539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123243529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61621769 + 61621770.

It is an arithmetic number, because the mean of its divisors is an integer number (61621770).

Almost surely, 2^123243539 is an apocalyptic number.

123243539 is a deficient number, since it is larger than the sum of its proper divisors (1).

123243539 is an equidigital number, since it uses as much as digits as its factorization.

123243539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 32.

The square root of 123243539 is about 11101.5106629684. The cubic root of 123243539 is about 497.6469961157.

The spelling of 123243539 in words is "one hundred twenty-three million, two hundred forty-three thousand, five hundred thirty-nine".