6541281081 has 12 divisors (see below), whose sum is σ = 9678969300. Its totient is φ = 4254491520.

The previous prime is 6541281067. The next prime is 6541281101. The reversal of 6541281081 is 1801821456.

6541281081 is a `hidden beast` number, since 6 + 541 + 2 + 8 + 108 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1369370025 + 5171911056 = 37005^2 + 71916^2 .

It is not a de Polignac number, because 6541281081 - 2⁶ = 6541281017 is a prime.

It is a super-2 number, since 2×6541281081² = 85576716361297057122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6541281011) 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, 8863156 + ... + 8863893.

It is an arithmetic number, because the mean of its divisors is an integer number (806580775).

Almost surely, 2^6541281081 is an apocalyptic number.

It is an amenable number.

6541281081 is a deficient number, since it is larger than the sum of its proper divisors (3137688219).

6541281081 is a wasteful number, since it uses less digits than its factorization.

6541281081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17727096 (or 17727093 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 6541281081 is about 80878.1866821951. The cubic root of 6541281081 is about 1870.1980669459.

The spelling of 6541281081 in words is "six billion, five hundred forty-one million, two hundred eighty-one thousand, eighty-one".