12812439251 has 4 divisors (see below), whose sum is σ = 12816061104. Its totient is φ = 12808817400.

The previous prime is 12812439191. The next prime is 12812439253. The reversal of 12812439251 is 15293421821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15293421821 = 10463 ⋅1461667.

It is a cyclic number.

It is not a de Polignac number, because 12812439251 - 2¹⁴ = 12812422867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12812439253) 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, 1805615 + ... + 1812696.

It is an arithmetic number, because the mean of its divisors is an integer number (3204015276).

Almost surely, 2^12812439251 is an apocalyptic number.

12812439251 is a deficient number, since it is larger than the sum of its proper divisors (3621853).

12812439251 is an equidigital number, since it uses as much as digits as its factorization.

12812439251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3621852.

The product of its digits is 34560, while the sum is 38.

The spelling of 12812439251 in words is "twelve billion, eight hundred twelve million, four hundred thirty-nine thousand, two hundred fifty-one".