1981159113 has 8 divisors (see below), whose sum is σ = 2680971808. Its totient is φ = 1301059584.

The previous prime is 1981159111. The next prime is 1981159153. The reversal of 1981159113 is 3119511891.

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

It is not a de Polignac number, because 1981159113 - 2¹ = 1981159111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981159111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4928056 + ... + 4928457.

It is an arithmetic number, because the mean of its divisors is an integer number (335121476).

Almost surely, 2^1981159113 is an apocalyptic number.

It is an amenable number.

1981159113 is a deficient number, since it is larger than the sum of its proper divisors (699812695).

1981159113 is an equidigital number, since it uses as much as digits as its factorization.

1981159113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9856583.

The product of its digits is 9720, while the sum is 39.

The square root of 1981159113 is about 44510.2135807053. The cubic root of 1981159113 is about 1255.9522226221.

The spelling of 1981159113 in words is "one billion, nine hundred eighty-one million, one hundred fifty-nine thousand, one hundred thirteen".