51931981943 has 2 divisors, whose sum is σ = 51931981944. Its totient is φ = 51931981942.

The previous prime is 51931981931. The next prime is 51931981951. The reversal of 51931981943 is 34918913915.

51931981943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51931981943 - 2²⁰ = 51930933367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51931981903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25965990971 + 25965990972.

It is an arithmetic number, because the mean of its divisors is an integer number (25965990972).

Almost surely, 2^51931981943 is an apocalyptic number.

51931981943 is a deficient number, since it is larger than the sum of its proper divisors (1).

51931981943 is an equidigital number, since it uses as much as digits as its factorization.

51931981943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 53.

The spelling of 51931981943 in words is "fifty-one billion, nine hundred thirty-one million, nine hundred eighty-one thousand, nine hundred forty-three".