123279513 has 16 divisors (see below), whose sum is σ = 188083200. Its totient is φ = 70359696.

The previous prime is 123279511. The next prime is 123279521. The reversal of 123279513 is 315972321.

It is not a de Polignac number, because 123279513 - 2¹ = 123279511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123279511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16788 + ... + 22986.

It is an arithmetic number, because the mean of its divisors is an integer number (11755200).

Almost surely, 2^123279513 is an apocalyptic number.

It is an amenable number.

123279513 is a deficient number, since it is larger than the sum of its proper divisors (64803687).

123279513 is an equidigital number, since it uses as much as digits as its factorization.

123279513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156.

The product of its digits is 11340, while the sum is 33.

The square root of 123279513 is about 11103.1307746959. The cubic root of 123279513 is about 497.6954113960.

The spelling of 123279513 in words is "one hundred twenty-three million, two hundred seventy-nine thousand, five hundred thirteen".