50231271991 has 4 divisors (see below), whose sum is σ = 50231869912. Its totient is φ = 50230674072.

The previous prime is 50231271989. The next prime is 50231272033. The reversal of 50231271991 is 19917213205.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 50231271991 - 2¹ = 50231271989 is a prime.

It is a super-2 number, since 2×50231271991² (a number of 22 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 (50231271911) 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, 147300 + ... + 349513.

It is an arithmetic number, because the mean of its divisors is an integer number (12557967478).

Almost surely, 2^50231271991 is an apocalyptic number.

50231271991 is a deficient number, since it is larger than the sum of its proper divisors (597921).

50231271991 is a wasteful number, since it uses less digits than its factorization.

50231271991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597920.

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 50231271991 in words is "fifty billion, two hundred thirty-one million, two hundred seventy-one thousand, nine hundred ninety-one".