1981344363 has 8 divisors (see below), whose sum is σ = 2642638800. Its totient is φ = 1320473088.

The previous prime is 1981344341. The next prime is 1981344419. The reversal of 1981344363 is 3634431891.

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

It is not a de Polignac number, because 1981344363 - 2⁵ = 1981344331 is a prime.

It is a super-3 number, since 3×1981344363³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981344163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94698 + ... + 113711.

It is an arithmetic number, because the mean of its divisors is an integer number (330329850).

Almost surely, 2^1981344363 is an apocalyptic number.

1981344363 is a deficient number, since it is larger than the sum of its proper divisors (661294437).

1981344363 is a wasteful number, since it uses less digits than its factorization.

1981344363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211581.

The product of its digits is 186624, while the sum is 42.

The square root of 1981344363 is about 44512.2945151112. The cubic root of 1981344363 is about 1255.9913677024.

The spelling of 1981344363 in words is "one billion, nine hundred eighty-one million, three hundred forty-four thousand, three hundred sixty-three".