123328781 has 2 divisors, whose sum is σ = 123328782. Its totient is φ = 123328780.

The previous prime is 123328769. The next prime is 123328789. The reversal of 123328781 is 187823321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 58767556 = 8035^2 + 7666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123328781 is a prime.

It is a super-2 number, since 2×123328781² = 30419976445891922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123328789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61664390 + 61664391.

It is an arithmetic number, because the mean of its divisors is an integer number (61664391).

Almost surely, 2^123328781 is an apocalyptic number.

It is an amenable number.

123328781 is a deficient number, since it is larger than the sum of its proper divisors (1).

123328781 is an equidigital number, since it uses as much as digits as its factorization.

123328781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 123328781 is about 11105.3492065761. The cubic root of 123328781 is about 497.7617030049.

The spelling of 123328781 in words is "one hundred twenty-three million, three hundred twenty-eight thousand, seven hundred eighty-one".