123999313 has 2 divisors, whose sum is σ = 123999314. Its totient is φ = 123999312.

The previous prime is 123999311. The next prime is 123999329. The reversal of 123999313 is 313999321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91929744 + 32069569 = 9588^2 + 5663^2 .

It is a cyclic number.

It is not a de Polignac number, because 123999313 - 2¹ = 123999311 is a prime.

Together with 123999311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123999311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61999656 + 61999657.

It is an arithmetic number, because the mean of its divisors is an integer number (61999657).

Almost surely, 2^123999313 is an apocalyptic number.

It is an amenable number.

123999313 is a deficient number, since it is larger than the sum of its proper divisors (1).

123999313 is an equidigital number, since it uses as much as digits as its factorization.

123999313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 40.

The square root of 123999313 is about 11135.4978784067. The cubic root of 123999313 is about 498.6621743040.

It can be divided in two parts, 12399 and 9313, that added together give a palindrome (21712).

The spelling of 123999313 in words is "one hundred twenty-three million, nine hundred ninety-nine thousand, three hundred thirteen".