12505279 has 4 divisors (see below), whose sum is σ = 12531240. Its totient is φ = 12479320.

The previous prime is 12505271. The next prime is 12505291. The reversal of 12505279 is 97250521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97250521 = 179 ⋅543299.

It is a cyclic number.

It is not a de Polignac number, because 12505279 - 2³ = 12505271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12505279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505271) 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, 12244 + ... + 13225.

It is an arithmetic number, because the mean of its divisors is an integer number (3132810).

Almost surely, 2^12505279 is an apocalyptic number.

12505279 is a deficient number, since it is larger than the sum of its proper divisors (25961).

12505279 is an equidigital number, since it uses as much as digits as its factorization.

12505279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25960.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 12505279 is about 3536.2803904668. The cubic root of 12505279 is about 232.1121076792.

The spelling of 12505279 in words is "twelve million, five hundred five thousand, two hundred seventy-nine".