1981194163 has 8 divisors (see below), whose sum is σ = 2245888400. Its totient is φ = 1732542048.

The previous prime is 1981194133. The next prime is 1981194167. The reversal of 1981194163 is 3614911891.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1981194163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981194167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010268 + ... + 4010761.

It is an arithmetic number, because the mean of its divisors is an integer number (280736050).

Almost surely, 2^1981194163 is an apocalyptic number.

1981194163 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1981194163 is a deficient number, since it is larger than the sum of its proper divisors (264694237).

1981194163 is a wasteful number, since it uses less digits than its factorization.

1981194163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8021061.

The product of its digits is 46656, while the sum is 43.

The square root of 1981194163 is about 44510.6073088202. The cubic root of 1981194163 is about 1255.9596292063.

The spelling of 1981194163 in words is "one billion, nine hundred eighty-one million, one hundred ninety-four thousand, one hundred sixty-three".