51091159204849 has 2 divisors, whose sum is σ = 51091159204850. Its totient is φ = 51091159204848.

The previous prime is 51091159204847. The next prime is 51091159204871. The reversal of 51091159204849 is 94840295119015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34201525114849 + 16889634090000 = 5848207^2 + 4109700^2 .

It is a cyclic number.

It is not a de Polignac number, because 51091159204849 - 2¹ = 51091159204847 is a prime.

It is a super-2 number, since 2×51091159204849² (a number of 28 digits) contains 22 as substring.

Together with 51091159204847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 51091159204793 and 51091159204802.

It is not a weakly prime, because it can be changed into another prime (51091159204847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25545579602424 + 25545579602425.

It is an arithmetic number, because the mean of its divisors is an integer number (25545579602425).

Almost surely, 2^{51091159204849} is an apocalyptic number.

It is an amenable number.

51091159204849 is a deficient number, since it is larger than the sum of its proper divisors (1).

51091159204849 is an equidigital number, since it uses as much as digits as its factorization.

51091159204849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4665600, while the sum is 58.

The spelling of 51091159204849 in words is "fifty-one trillion, ninety-one billion, one hundred fifty-nine million, two hundred four thousand, eight hundred forty-nine".