5121831311991 has 96 divisors (see below), whose sum is σ = 8012326533120. Its totient is φ = 3141213530112.

The previous prime is 5121831311941. The next prime is 5121831312023. The reversal of 5121831311991 is 1991131381215.

5121831311991 is a `hidden beast` number, since 5 + 1 + 218 + 31 + 311 + 9 + 91 = 666.

It is not a de Polignac number, because 5121831311991 - 2¹⁵ = 5121831279223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5121831311911) 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 95 ways as a sum of consecutive naturals, for example, 565381420 + ... + 565390478.

It is an arithmetic number, because the mean of its divisors is an integer number (83461734720).

Almost surely, 2^{5121831311991} is an apocalyptic number.

5121831311991 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

5121831311991 is a deficient number, since it is larger than the sum of its proper divisors (2890495221129).

5121831311991 is a wasteful number, since it uses less digits than its factorization.

5121831311991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9605 (or 9602 counting only the distinct ones).

The product of its digits is 58320, while the sum is 45.

The spelling of 5121831311991 in words is "five trillion, one hundred twenty-one billion, eight hundred thirty-one million, three hundred eleven thousand, nine hundred ninety-one".