123491679 has 4 divisors (see below), whose sum is σ = 164655576. Its totient is φ = 82327784.

The previous prime is 123491651. The next prime is 123491699. The reversal of 123491679 is 976194321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976194321 = 3 ⋅325398107.

It is a cyclic number.

It is not a de Polignac number, because 123491679 - 2¹¹ = 123489631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123491679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123491699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20581944 + ... + 20581949.

It is an arithmetic number, because the mean of its divisors is an integer number (41163894).

Almost surely, 2^123491679 is an apocalyptic number.

123491679 is a deficient number, since it is larger than the sum of its proper divisors (41163897).

123491679 is an equidigital number, since it uses as much as digits as its factorization.

123491679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41163896.

The product of its digits is 81648, while the sum is 42.

The square root of 123491679 is about 11112.6809996508. The cubic root of 123491679 is about 497.9807616639.

It can be divided in two parts, 12349 and 1679, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 123491679 in words is "one hundred twenty-three million, four hundred ninety-one thousand, six hundred seventy-nine".