51549734191 has 2 divisors, whose sum is σ = 51549734192. Its totient is φ = 51549734190.

The previous prime is 51549734167. The next prime is 51549734237. The reversal of 51549734191 is 19143794515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51549734191 - 2⁹ = 51549733679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51549734891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25774867095 + 25774867096.

It is an arithmetic number, because the mean of its divisors is an integer number (25774867096).

Almost surely, 2^51549734191 is an apocalyptic number.

51549734191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51549734191 is an equidigital number, since it uses as much as digits as its factorization.

51549734191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 49.

The spelling of 51549734191 in words is "fifty-one billion, five hundred forty-nine million, seven hundred thirty-four thousand, one hundred ninety-one".