51291421943 has 2 divisors, whose sum is σ = 51291421944. Its totient is φ = 51291421942.

The previous prime is 51291421933. The next prime is 51291421991. The reversal of 51291421943 is 34912419215.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51291421943 - 2⁴ = 51291421927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51291421943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51291421913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645710971 + 25645710972.

It is an arithmetic number, because the mean of its divisors is an integer number (25645710972).

Almost surely, 2^51291421943 is an apocalyptic number.

51291421943 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291421943 is an equidigital number, since it uses as much as digits as its factorization.

51291421943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The spelling of 51291421943 in words is "fifty-one billion, two hundred ninety-one million, four hundred twenty-one thousand, nine hundred forty-three".