123305213 has 4 divisors (see below), whose sum is σ = 123327708. Its totient is φ = 123282720.

The previous prime is 123305177. The next prime is 123305227. The reversal of 123305213 is 312503321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85137529 + 38167684 = 9227^2 + 6178^2 .

It is a cyclic number.

It is not a de Polignac number, because 123305213 - 2²² = 119110909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123305243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945 + ... + 15977.

It is an arithmetic number, because the mean of its divisors is an integer number (30831927).

Almost surely, 2^123305213 is an apocalyptic number.

It is an amenable number.

123305213 is a deficient number, since it is larger than the sum of its proper divisors (22495).

123305213 is an equidigital number, since it uses as much as digits as its factorization.

123305213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22494.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 123305213 is about 11104.2880456155. The cubic root of 123305213 is about 497.7299937394.

Adding to 123305213 its reverse (312503321), we get a palindrome (435808534).

The spelling of 123305213 in words is "one hundred twenty-three million, three hundred five thousand, two hundred thirteen".