9816581142 has 24 divisors (see below), whose sum is σ = 22002683040. Its totient is φ = 3159359280.

The previous prime is 9816581123. The next prime is 9816581147. The reversal of 9816581142 is 2411856189.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9816581147) 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 11 ways as a sum of consecutive naturals, for example, 9402334 + ... + 9403377.

It is an arithmetic number, because the mean of its divisors is an integer number (916778460).

Almost surely, 2^9816581142 is an apocalyptic number.

9816581142 is an abundant number, since it is smaller than the sum of its proper divisors (12186101898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9816581142 is a wasteful number, since it uses less digits than its factorization.

9816581142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18805748 (or 18805745 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 9816581142 is about 99078.6613857898. The cubic root of 9816581142 is about 2141.1811936304.

The spelling of 9816581142 in words is "nine billion, eight hundred sixteen million, five hundred eighty-one thousand, one hundred forty-two".