123235312013 has 12 divisors (see below), whose sum is σ = 135470012160. Its totient is φ = 112021336680.

The previous prime is 123235311961. The next prime is 123235312043. The reversal of 123235312013 is 310213532321.

It is a de Polignac number, because none of the positive numbers 2^k-123235312013 is a prime.

It is a super-2 number, since 2×123235312013² (a number of 23 digits) contains 22 as substring.

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 (123235312043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1389506 + ... + 1475532.

It is an arithmetic number, because the mean of its divisors is an integer number (11289167680).

Almost surely, 2^123235312013 is an apocalyptic number.

It is an amenable number.

123235312013 is a deficient number, since it is larger than the sum of its proper divisors (12234700147).

123235312013 is a wasteful number, since it uses less digits than its factorization.

123235312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97888 (or 97877 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 123235312013 its reverse (310213532321), we get a palindrome (433448844334).

The spelling of 123235312013 in words is "one hundred twenty-three billion, two hundred thirty-five million, three hundred twelve thousand, thirteen".