123602135281 has 2 divisors, whose sum is σ = 123602135282. Its totient is φ = 123602135280.

The previous prime is 123602135273. The next prime is 123602135311. The reversal of 123602135281 is 182531206321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120211984656 + 3390150625 = 346716^2 + 58225^2 .

It is a cyclic number.

It is not a de Polignac number, because 123602135281 - 2³ = 123602135273 is a prime.

It is a super-2 number, since 2×123602135281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123602135201) 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 as a sum of consecutive naturals, namely, 61801067640 + 61801067641.

It is an arithmetic number, because the mean of its divisors is an integer number (61801067641).

Almost surely, 2^123602135281 is an apocalyptic number.

It is an amenable number.

123602135281 is a deficient number, since it is larger than the sum of its proper divisors (1).

123602135281 is an equidigital number, since it uses as much as digits as its factorization.

123602135281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 123602135281 in words is "one hundred twenty-three billion, six hundred two million, one hundred thirty-five thousand, two hundred eighty-one".