6181081281 has 12 divisors (see below), whose sum is σ = 8943872080. Its totient is φ = 4113500760.

The previous prime is 6181081279. The next prime is 6181081301. The reversal of 6181081281 is 1821801816.

It is a happy number.

6181081281 is a `hidden beast` number, since 618 + 10 + 8 + 1 + 28 + 1 = 666.

It is not a de Polignac number, because 6181081281 - 2¹ = 6181081279 is a prime.

It is a super-2 number, since 2×6181081281² = 76411531604657201922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6181081981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 596251 + ... + 606528.

Almost surely, 2^6181081281 is an apocalyptic number.

It is an amenable number.

6181081281 is a deficient number, since it is larger than the sum of its proper divisors (2762790799).

6181081281 is a wasteful number, since it uses less digits than its factorization.

6181081281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203356 (or 1203353 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 36.

The square root of 6181081281 is about 78619.8529698447. The cubic root of 6181081281 is about 1835.2200763104.

The spelling of 6181081281 in words is "six billion, one hundred eighty-one million, eighty-one thousand, two hundred eighty-one".