12531279225 has 24 divisors (see below), whose sum is σ = 20774880640. Its totient is φ = 6665123520.

The previous prime is 12531279191. The next prime is 12531279269. The reversal of 12531279225 is 52297213521.

It is not a de Polignac number, because 12531279225 - 2¹¹ = 12531277177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200110 + ... + 255159.

Almost surely, 2^12531279225 is an apocalyptic number.

12531279225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12531279225 is a deficient number, since it is larger than the sum of its proper divisors (8243601415).

12531279225 is a wasteful number, since it uses less digits than its factorization.

12531279225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455649 (or 455644 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The spelling of 12531279225 in words is "twelve billion, five hundred thirty-one million, two hundred seventy-nine thousand, two hundred twenty-five".