8481781 has 16 divisors (see below), whose sum is σ = 10759680. Its totient is φ = 6493680.

The previous prime is 8481773. The next prime is 8481787. The reversal of 8481781 is 1871848.

It is a cyclic number.

It is not a de Polignac number, because 8481781 - 2³ = 8481773 is a prime.

It is a super-2 number, since 2×8481781² = 143881217863922, 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 8481781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8481787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3610 + ... + 5476.

It is an arithmetic number, because the mean of its divisors is an integer number (672480).

Almost surely, 2^8481781 is an apocalyptic number.

It is an amenable number.

8481781 is a deficient number, since it is larger than the sum of its proper divisors (2277899).

8481781 is a wasteful number, since it uses less digits than its factorization.

8481781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944.

The product of its digits is 14336, while the sum is 37.

The square root of 8481781 is about 2912.3497386131. The cubic root of 8481781 is about 203.9368396678.

The spelling of 8481781 in words is "eight million, four hundred eighty-one thousand, seven hundred eighty-one".