51171197113 has 2 divisors, whose sum is σ = 51171197114. Its totient is φ = 51171197112.

The previous prime is 51171197093. The next prime is 51171197183. The reversal of 51171197113 is 31179117115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50774510224 + 396686889 = 225332^2 + 19917^2 .

It is a cyclic number.

It is not a de Polignac number, because 51171197113 - 2²⁹ = 50634326201 is a prime.

It is not a weakly prime, because it can be changed into another prime (51171197183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585598556 + 25585598557.

It is an arithmetic number, because the mean of its divisors is an integer number (25585598557).

Almost surely, 2^51171197113 is an apocalyptic number.

It is an amenable number.

51171197113 is a deficient number, since it is larger than the sum of its proper divisors (1).

51171197113 is an equidigital number, since it uses as much as digits as its factorization.

51171197113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6615, while the sum is 37.

The spelling of 51171197113 in words is "fifty-one billion, one hundred seventy-one million, one hundred ninety-seven thousand, one hundred thirteen".