51199948771 has 2 divisors, whose sum is σ = 51199948772. Its totient is φ = 51199948770.

The previous prime is 51199948759. The next prime is 51199948853. The reversal of 51199948771 is 17784999115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51199948771 - 2¹¹ = 51199946723 is a prime.

It is not a weakly prime, because it can be changed into another prime (51199948741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25599974385 + 25599974386.

It is an arithmetic number, because the mean of its divisors is an integer number (25599974386).

Almost surely, 2^51199948771 is an apocalyptic number.

51199948771 is a deficient number, since it is larger than the sum of its proper divisors (1).

51199948771 is an equidigital number, since it uses as much as digits as its factorization.

51199948771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 61.

The spelling of 51199948771 in words is "fifty-one billion, one hundred ninety-nine million, nine hundred forty-eight thousand, seven hundred seventy-one".