51150733981 has 2 divisors, whose sum is σ = 51150733982. Its totient is φ = 51150733980.

The previous prime is 51150733943. The next prime is 51150734069. The reversal of 51150733981 is 18933705115.

51150733981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44282468356 + 6868265625 = 210434^2 + 82875^2 .

It is a cyclic number.

It is not a de Polignac number, because 51150733981 - 2¹³ = 51150725789 is a prime.

It is a super-2 number, since 2×51150733981² (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 (51150713981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25575366990 + 25575366991.

It is an arithmetic number, because the mean of its divisors is an integer number (25575366991).

Almost surely, 2^51150733981 is an apocalyptic number.

It is an amenable number.

51150733981 is a deficient number, since it is larger than the sum of its proper divisors (1).

51150733981 is an equidigital number, since it uses as much as digits as its factorization.

51150733981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 51150733981 in words is "fifty-one billion, one hundred fifty million, seven hundred thirty-three thousand, nine hundred eighty-one".