51971014991 has 12 divisors (see below), whose sum is σ = 60479189712. Its totient is φ = 44529555168.

The previous prime is 51971014951. The next prime is 51971015071. The reversal of 51971014991 is 19941017915.

51971014991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51971014991 - 2¹⁰ = 51971013967 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51971014951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72395 + ... + 330428.

It is an arithmetic number, because the mean of its divisors is an integer number (5039932476).

Almost surely, 2^51971014991 is an apocalyptic number.

51971014991 is a deficient number, since it is larger than the sum of its proper divisors (8508174721).

51971014991 is a wasteful number, since it uses less digits than its factorization.

51971014991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405470 (or 405463 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 47.

The spelling of 51971014991 in words is "fifty-one billion, nine hundred seventy-one million, fourteen thousand, nine hundred ninety-one".