123943609 has 2 divisors, whose sum is σ = 123943610. Its totient is φ = 123943608.

The previous prime is 123943591. The next prime is 123943613. The reversal of 123943609 is 906349321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112954384 + 10989225 = 10628^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 123943609 - 2¹¹ = 123941561 is a prime.

It is not a weakly prime, because it can be changed into another prime (123943679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61971804 + 61971805.

It is an arithmetic number, because the mean of its divisors is an integer number (61971805).

Almost surely, 2^123943609 is an apocalyptic number.

It is an amenable number.

123943609 is a deficient number, since it is larger than the sum of its proper divisors (1).

123943609 is an equidigital number, since it uses as much as digits as its factorization.

123943609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 123943609 is about 11132.9964070775. The cubic root of 123943609 is about 498.5874920670.

The spelling of 123943609 in words is "one hundred twenty-three million, nine hundred forty-three thousand, six hundred nine".