123265309 has 2 divisors, whose sum is σ = 123265310. Its totient is φ = 123265308.

The previous prime is 123265297. The next prime is 123265343. The reversal of 123265309 is 903562321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79744900 + 43520409 = 8930^2 + 6597^2 .

It is an emirp because it is prime and its reverse (903562321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123265309 - 2¹³ = 123257117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123265409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61632654 + 61632655.

It is an arithmetic number, because the mean of its divisors is an integer number (61632655).

Almost surely, 2^123265309 is an apocalyptic number.

It is an amenable number.

123265309 is a deficient number, since it is larger than the sum of its proper divisors (1).

123265309 is an equidigital number, since it uses as much as digits as its factorization.

123265309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 123265309 is about 11102.4911168620. The cubic root of 123265309 is about 497.6762961974.

The spelling of 123265309 in words is "one hundred twenty-three million, two hundred sixty-five thousand, three hundred nine".