81276481 has 8 divisors (see below), whose sum is σ = 95485824. Its totient is φ = 68203920.

The previous prime is 81276463. The next prime is 81276499. The reversal of 81276481 is 18467218.

It is the 3681-st star number.

It is an interprime number because it is at equal distance from previous prime (81276463) and next prime (81276499).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81276481 - 2⁵ = 81276449 is a prime.

It is a super-2 number, since 2×81276481² = 13211732727486722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81276481.

It is not an unprimeable number, because it can be changed into a prime (81276781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284041 + ... + 284326.

It is an arithmetic number, because the mean of its divisors is an integer number (11935728).

Almost surely, 2^81276481 is an apocalyptic number.

It is an amenable number.

81276481 is a deficient number, since it is larger than the sum of its proper divisors (14209343).

81276481 is a wasteful number, since it uses less digits than its factorization.

81276481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568391.

The product of its digits is 21504, while the sum is 37.

The square root of 81276481 is about 9015.3469705830. The cubic root of 81276481 is about 433.1666016676.

The spelling of 81276481 in words is "eighty-one million, two hundred seventy-six thousand, four hundred eighty-one".