123613813 has 4 divisors (see below), whose sum is σ = 123643660. Its totient is φ = 123583968.

The previous prime is 123613801. The next prime is 123613823. The reversal of 123613813 is 318316321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318316321 = 443 ⋅718547.

It can be written as a sum of positive squares in 2 ways, for example, as 7879249 + 115734564 = 2807^2 + 10758^2 .

It is a cyclic number.

It is not a de Polignac number, because 123613813 - 2¹⁷ = 123482741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123613823) 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, 7470 + ... + 17407.

It is an arithmetic number, because the mean of its divisors is an integer number (30910915).

Almost surely, 2^123613813 is an apocalyptic number.

It is an amenable number.

123613813 is a deficient number, since it is larger than the sum of its proper divisors (29847).

123613813 is an equidigital number, since it uses as much as digits as its factorization.

123613813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29846.

The product of its digits is 2592, while the sum is 28.

The square root of 123613813 is about 11118.1748951885. The cubic root of 123613813 is about 498.1448762106.

The spelling of 123613813 in words is "one hundred twenty-three million, six hundred thirteen thousand, eight hundred thirteen".