123391313 has 4 divisors (see below), whose sum is σ = 123418548. Its totient is φ = 123364080.

The previous prime is 123391283. The next prime is 123391327. The reversal of 123391313 is 313193321.

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 32913169 + 90478144 = 5737^2 + 9512^2 .

It is a cyclic number.

It is not a de Polignac number, because 123391313 - 2⁶ = 123391249 is a prime.

It is a super-2 number, since 2×123391313² = 30450832247727938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123391363) 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, 5006 + ... + 16487.

It is an arithmetic number, because the mean of its divisors is an integer number (30854637).

Almost surely, 2^123391313 is an apocalyptic number.

It is an amenable number.

123391313 is a deficient number, since it is larger than the sum of its proper divisors (27235).

123391313 is an equidigital number, since it uses as much as digits as its factorization.

123391313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27234.

The product of its digits is 1458, while the sum is 26.

The square root of 123391313 is about 11108.1642497759. The cubic root of 123391313 is about 497.8458163140.

The spelling of 123391313 in words is "one hundred twenty-three million, three hundred ninety-one thousand, three hundred thirteen".