51050612981 has 2 divisors, whose sum is σ = 51050612982. Its totient is φ = 51050612980.

The previous prime is 51050612971. The next prime is 51050613059. The reversal of 51050612981 is 18921605015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27098098225 + 23952514756 = 164615^2 + 154766^2 .

It is a cyclic number.

It is not a de Polignac number, because 51050612981 - 2⁶ = 51050612917 is a prime.

It is a super-2 number, since 2×51050612981² (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 (51050612971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25525306490 + 25525306491.

It is an arithmetic number, because the mean of its divisors is an integer number (25525306491).

Almost surely, 2^51050612981 is an apocalyptic number.

It is an amenable number.

51050612981 is a deficient number, since it is larger than the sum of its proper divisors (1).

51050612981 is an equidigital number, since it uses as much as digits as its factorization.

51050612981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 38.

The spelling of 51050612981 in words is "fifty-one billion, fifty million, six hundred twelve thousand, nine hundred eighty-one".