12791217831 has 16 divisors (see below), whose sum is σ = 19523195904. Its totient is φ = 7297336224.

The previous prime is 12791217781. The next prime is 12791217841. The reversal of 12791217831 is 13871219721.

It is not a de Polignac number, because 12791217831 - 2²¹ = 12789120679 is a prime.

It is a super-2 number, since 2×12791217831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12791217841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483951 + ... + 509696.

It is an arithmetic number, because the mean of its divisors is an integer number (1220199744).

Almost surely, 2^12791217831 is an apocalyptic number.

12791217831 is a deficient number, since it is larger than the sum of its proper divisors (6731978073).

12791217831 is an equidigital number, since it uses as much as digits as its factorization.

12791217831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994270.

The product of its digits is 42336, while the sum is 42.

The spelling of 12791217831 in words is "twelve billion, seven hundred ninety-one million, two hundred seventeen thousand, eight hundred thirty-one".