123511313 has 4 divisors (see below), whose sum is σ = 123536868. Its totient is φ = 123485760.

The previous prime is 123511301. The next prime is 123511321. The reversal of 123511313 is 313115321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21743569 + 101767744 = 4663^2 + 10088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123511313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123519313) 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, 3068 + ... + 16013.

It is an arithmetic number, because the mean of its divisors is an integer number (30884217).

Almost surely, 2^123511313 is an apocalyptic number.

It is an amenable number.

123511313 is a deficient number, since it is larger than the sum of its proper divisors (25555).

123511313 is an equidigital number, since it uses as much as digits as its factorization.

123511313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25554.

The product of its digits is 270, while the sum is 20.

The square root of 123511313 is about 11113.5643697241. The cubic root of 123511313 is about 498.0071516637.

Adding to 123511313 its reverse (313115321), we get a palindrome (436626634).

The spelling of 123511313 in words is "one hundred twenty-three million, five hundred eleven thousand, three hundred thirteen".