12781008251 has 4 divisors (see below), whose sum is σ = 13942918104. Its totient is φ = 11619098400.

The previous prime is 12781008203. The next prime is 12781008263. The reversal of 12781008251 is 15280018721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15280018721 = 11 ⋅1389092611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12781008251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12781008451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580954910 + ... + 580954931.

It is an arithmetic number, because the mean of its divisors is an integer number (3485729526).

Almost surely, 2^12781008251 is an apocalyptic number.

12781008251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12781008251 is a deficient number, since it is larger than the sum of its proper divisors (1161909853).

12781008251 is a wasteful number, since it uses less digits than its factorization.

12781008251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161909852.

The product of its (nonzero) digits is 8960, while the sum is 35.

The spelling of 12781008251 in words is "twelve billion, seven hundred eighty-one million, eight thousand, two hundred fifty-one".