123220313 has 2 divisors, whose sum is σ = 123220314. Its totient is φ = 123220312.

The previous prime is 123220309. The next prime is 123220337. The reversal of 123220313 is 313022321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102353689 + 20866624 = 10117^2 + 4568^2 .

It is a cyclic number.

It is not a de Polignac number, because 123220313 - 2² = 123220309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123220291 and 123220300.

It is not a weakly prime, because it can be changed into another prime (123220613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610156 + 61610157.

It is an arithmetic number, because the mean of its divisors is an integer number (61610157).

Almost surely, 2^123220313 is an apocalyptic number.

It is an amenable number.

123220313 is a deficient number, since it is larger than the sum of its proper divisors (1).

123220313 is an equidigital number, since it uses as much as digits as its factorization.

123220313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 123220313 is about 11100.4645398290. The cubic root of 123220313 is about 497.6157326099.

Adding to 123220313 its reverse (313022321), we get a palindrome (436242634).

The spelling of 123220313 in words is "one hundred twenty-three million, two hundred twenty thousand, three hundred thirteen".