123520279 has 2 divisors, whose sum is σ = 123520280. Its totient is φ = 123520278.

The previous prime is 123520247. The next prime is 123520289. The reversal of 123520279 is 972025321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123520279 - 2⁵ = 123520247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123520279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123520289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61760139 + 61760140.

It is an arithmetic number, because the mean of its divisors is an integer number (61760140).

Almost surely, 2^123520279 is an apocalyptic number.

123520279 is a deficient number, since it is larger than the sum of its proper divisors (1).

123520279 is an equidigital number, since it uses as much as digits as its factorization.

123520279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 123520279 is about 11113.9677433399. The cubic root of 123520279 is about 498.0192019069.

The spelling of 123520279 in words is "one hundred twenty-three million, five hundred twenty thousand, two hundred seventy-nine".