123220613 has 2 divisors, whose sum is σ = 123220614. Its totient is φ = 123220612.

The previous prime is 123220597. The next prime is 123220627. The reversal of 123220613 is 316022321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 51868804 = 8447^2 + 7202^2 .

It is a cyclic number.

It is not a de Polignac number, because 123220613 - 2⁴ = 123220597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123220663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610306 + 61610307.

It is an arithmetic number, because the mean of its divisors is an integer number (61610307).

Almost surely, 2^123220613 is an apocalyptic number.

It is an amenable number.

123220613 is a deficient number, since it is larger than the sum of its proper divisors (1).

123220613 is an equidigital number, since it uses as much as digits as its factorization.

123220613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 123220613 is about 11100.4780527687. The cubic root of 123220613 is about 497.6161364519.

Adding to 123220613 its reverse (316022321), we get a palindrome (439242934).

The spelling of 123220613 in words is "one hundred twenty-three million, two hundred twenty thousand, six hundred thirteen".