123267509 has 2 divisors, whose sum is σ = 123267510. Its totient is φ = 123267508.

The previous prime is 123267481. The next prime is 123267553. The reversal of 123267509 is 905762321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116165284 + 7102225 = 10778^2 + 2665^2 .

It is an emirp because it is prime and its reverse (905762321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123267509 - 2¹⁶ = 123201973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123267569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61633754 + 61633755.

It is an arithmetic number, because the mean of its divisors is an integer number (61633755).

Almost surely, 2^123267509 is an apocalyptic number.

It is an amenable number.

123267509 is a deficient number, since it is larger than the sum of its proper divisors (1).

123267509 is an equidigital number, since it uses as much as digits as its factorization.

123267509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 123267509 is about 11102.5901932837. The cubic root of 123267509 is about 497.6792569691.

The spelling of 123267509 in words is "one hundred twenty-three million, two hundred sixty-seven thousand, five hundred nine".