123805613 has 2 divisors, whose sum is σ = 123805614. Its totient is φ = 123805612.

The previous prime is 123805607. The next prime is 123805621. The reversal of 123805613 is 316508321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117983044 + 5822569 = 10862^2 + 2413^2 .

It is a cyclic number.

It is not a de Polignac number, because 123805613 - 2¹⁶ = 123740077 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 (123805603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61902806 + 61902807.

It is an arithmetic number, because the mean of its divisors is an integer number (61902807).

Almost surely, 2^123805613 is an apocalyptic number.

It is an amenable number.

123805613 is a deficient number, since it is larger than the sum of its proper divisors (1).

123805613 is an equidigital number, since it uses as much as digits as its factorization.

123805613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 123805613 is about 11126.7970683391. The cubic root of 123805613 is about 498.4023846876.

The spelling of 123805613 in words is "one hundred twenty-three million, eight hundred five thousand, six hundred thirteen".