51106004981 has 2 divisors, whose sum is σ = 51106004982. Its totient is φ = 51106004980.

The previous prime is 51106004881. The next prime is 51106005011. The reversal of 51106004981 is 18940060115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50236049956 + 869955025 = 224134^2 + 29495^2 .

It is a cyclic number.

It is not a de Polignac number, because 51106004981 - 2³⁰ = 50032263157 is a prime.

It is a super-2 number, since 2×51106004981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51106004381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25553002490 + 25553002491.

It is an arithmetic number, because the mean of its divisors is an integer number (25553002491).

Almost surely, 2^51106004981 is an apocalyptic number.

It is an amenable number.

51106004981 is a deficient number, since it is larger than the sum of its proper divisors (1).

51106004981 is an equidigital number, since it uses as much as digits as its factorization.

51106004981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 51106004981 in words is "fifty-one billion, one hundred six million, four thousand, nine hundred eighty-one".