5191936308981 has 6 divisors (see below), whose sum is σ = 7499463557430. Its totient is φ = 3461290872648.

The previous prime is 5191936308973. The next prime is 5191936308991. The reversal of 5191936308981 is 1898036391915.

5191936308981 is a `hidden beast` number, since 5 + 191 + 9 + 363 + 0 + 8 + 9 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2767481780625 + 2424454528356 = 1663575^2 + 1557066^2 .

It is not a de Polignac number, because 5191936308981 - 2³ = 5191936308973 is a prime.

It is a super-3 number, since 3×5191936308981³ (a number of 39 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5191936308931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 288440906046 + ... + 288440906063.

It is an arithmetic number, because the mean of its divisors is an integer number (1249910592905).

Almost surely, 2^{5191936308981} is an apocalyptic number.

It is an amenable number.

5191936308981 is a deficient number, since it is larger than the sum of its proper divisors (2307527248449).

5191936308981 is a wasteful number, since it uses less digits than its factorization.

5191936308981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576881812115 (or 576881812112 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

It can be divided in two parts, 51919 and 36308981, that added together give a square (36360900 = 6030²).

The spelling of 5191936308981 in words is "five trillion, one hundred ninety-one billion, nine hundred thirty-six million, three hundred eight thousand, nine hundred eighty-one".