123643731313 has 2 divisors, whose sum is σ = 123643731314. Its totient is φ = 123643731312.

The previous prime is 123643731293. The next prime is 123643731377. The reversal of 123643731313 is 313137346321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122463602704 + 1180128609 = 349948^2 + 34353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123643731313 is a prime.

It is not a weakly prime, because it can be changed into another prime (123643761313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61821865656 + 61821865657.

It is an arithmetic number, because the mean of its divisors is an integer number (61821865657).

Almost surely, 2^123643731313 is an apocalyptic number.

It is an amenable number.

123643731313 is a deficient number, since it is larger than the sum of its proper divisors (1).

123643731313 is an equidigital number, since it uses as much as digits as its factorization.

123643731313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 37.

The spelling of 123643731313 in words is "one hundred twenty-three billion, six hundred forty-three million, seven hundred thirty-one thousand, three hundred thirteen".