123541309 has 2 divisors, whose sum is σ = 123541310. Its totient is φ = 123541308.

The previous prime is 123541307. The next prime is 123541351. The reversal of 123541309 is 903145321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91584900 + 31956409 = 9570^2 + 5653^2 .

It is a cyclic number.

It is not a de Polignac number, because 123541309 - 2¹ = 123541307 is a prime.

Together with 123541307, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123541307) 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 as a sum of consecutive naturals, namely, 61770654 + 61770655.

It is an arithmetic number, because the mean of its divisors is an integer number (61770655).

Almost surely, 2^123541309 is an apocalyptic number.

It is an amenable number.

123541309 is a deficient number, since it is larger than the sum of its proper divisors (1).

123541309 is an equidigital number, since it uses as much as digits as its factorization.

123541309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 123541309 is about 11114.9138098323. The cubic root of 123541309 is about 498.0474637965.

The spelling of 123541309 in words is "one hundred twenty-three million, five hundred forty-one thousand, three hundred nine".