12711309781 has 8 divisors (see below), whose sum is σ = 13475984384. Its totient is φ = 11968799760.

The previous prime is 12711309761. The next prime is 12711309791. The reversal of 12711309781 is 18790311721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12711309781 - 2²⁹ = 12174438869 is a prime.

It is a super-2 number, since 2×12711309781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12711309761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5539965 + ... + 5542258.

It is an arithmetic number, because the mean of its divisors is an integer number (1684498048).

Almost surely, 2^12711309781 is an apocalyptic number.

It is an amenable number.

12711309781 is a deficient number, since it is larger than the sum of its proper divisors (764674603).

12711309781 is a wasteful number, since it uses less digits than its factorization.

12711309781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11082291.

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 12711309781 in words is "twelve billion, seven hundred eleven million, three hundred nine thousand, seven hundred eighty-one".