12731971751 has 4 divisors (see below), whose sum is σ = 12742332600. Its totient is φ = 12721610904.

The previous prime is 12731971739. The next prime is 12731971771. The reversal of 12731971751 is 15717913721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15717913721 = 1481 ⋅10613041.

It is a cyclic number.

It is not a de Polignac number, because 12731971751 - 2¹⁸ = 12731709607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731971711) 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, 5178581 + ... + 5181038.

It is an arithmetic number, because the mean of its divisors is an integer number (3185583150).

Almost surely, 2^12731971751 is an apocalyptic number.

12731971751 is a deficient number, since it is larger than the sum of its proper divisors (10360849).

12731971751 is a wasteful number, since it uses less digits than its factorization.

12731971751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10360848.

The product of its digits is 92610, while the sum is 44.

The spelling of 12731971751 in words is "twelve billion, seven hundred thirty-one million, nine hundred seventy-one thousand, seven hundred fifty-one".