51494939983981 has 16 divisors (see below), whose sum is σ = 55687134178368. Its totient is φ = 47335758854400.

The previous prime is 51494939983979. The next prime is 51494939983999. The reversal of 51494939983981 is 18938993949415.

51494939983981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51494939983981 - 2¹ = 51494939983979 is a prime.

It is a super-2 number, since 2×51494939983981² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51494939983895 and 51494939983904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51494939983901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271006650 + ... + 271196596.

It is an arithmetic number, because the mean of its divisors is an integer number (3480445886148).

Almost surely, 2^{51494939983981} is an apocalyptic number.

It is an amenable number.

51494939983981 is a deficient number, since it is larger than the sum of its proper divisors (4192194194387).

51494939983981 is a wasteful number, since it uses less digits than its factorization.

51494939983981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276732.

The product of its digits is 2720977920, while the sum is 82.

The spelling of 51494939983981 in words is "fifty-one trillion, four hundred ninety-four billion, nine hundred thirty-nine million, nine hundred eighty-three thousand, nine hundred eighty-one".