9781018481 has 12 divisors (see below), whose sum is σ = 10594558080. Its totient is φ = 9025838640.

The previous prime is 9781018469. The next prime is 9781018547. The reversal of 9781018481 is 1848101879.

It is not a de Polignac number, because 9781018481 - 2²² = 9776824177 is a prime.

It is a super-2 number, since 2×9781018481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9781018441) 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, 708200 + ... + 721878.

It is an arithmetic number, because the mean of its divisors is an integer number (882879840).

Almost surely, 2^9781018481 is an apocalyptic number.

It is an amenable number.

9781018481 is a deficient number, since it is larger than the sum of its proper divisors (813539599).

9781018481 is a wasteful number, since it uses less digits than its factorization.

9781018481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17936 (or 17923 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 47.

The square root of 9781018481 is about 98899.0317495576. The cubic root of 9781018481 is about 2138.5924363305.

The spelling of 9781018481 in words is "nine billion, seven hundred eighty-one million, eighteen thousand, four hundred eighty-one".