123445909 has 2 divisors, whose sum is σ = 123445910. Its totient is φ = 123445908.

The previous prime is 123445873. The next prime is 123445939. The reversal of 123445909 is 909544321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123143409 + 302500 = 11097^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 123445909 - 2¹¹ = 123443861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123445939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61722954 + 61722955.

It is an arithmetic number, because the mean of its divisors is an integer number (61722955).

Almost surely, 2^123445909 is an apocalyptic number.

It is an amenable number.

123445909 is a deficient number, since it is larger than the sum of its proper divisors (1).

123445909 is an equidigital number, since it uses as much as digits as its factorization.

123445909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 123445909 is about 11110.6214497660. The cubic root of 123445909 is about 497.9192314833.

The spelling of 123445909 in words is "one hundred twenty-three million, four hundred forty-five thousand, nine hundred nine".