123968431613 has 4 divisors (see below), whose sum is σ = 133504464828. Its totient is φ = 114432398400.

The previous prime is 123968431579. The next prime is 123968431621. The reversal of 123968431613 is 316134869321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 316134869321 = 239 ⋅1322740039.

It can be written as a sum of positive squares in 2 ways, for example, as 22081068409 + 101887363204 = 148597^2 + 319198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123968431613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123968431913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4768016588 + ... + 4768016613.

It is an arithmetic number, because the mean of its divisors is an integer number (33376116207).

Almost surely, 2^123968431613 is an apocalyptic number.

123968431613 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123968431613 is a deficient number, since it is larger than the sum of its proper divisors (9536033215).

123968431613 is an equidigital number, since it uses as much as digits as its factorization.

123968431613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9536033214.

The product of its digits is 559872, while the sum is 47.

The spelling of 123968431613 in words is "one hundred twenty-three billion, nine hundred sixty-eight million, four hundred thirty-one thousand, six hundred thirteen".