9981603 has 16 divisors (see below), whose sum is σ = 14844960. Its totient is φ = 6628608.

The previous prime is 9981599. The next prime is 9981611. The reversal of 9981603 is 3061899.

It is not a de Polignac number, because 9981603 - 2² = 9981599 is a prime.

9981603 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9980603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8551 + ... + 9647.

It is an arithmetic number, because the mean of its divisors is an integer number (927810).

Almost surely, 2^9981603 is an apocalyptic number.

9981603 is a deficient number, since it is larger than the sum of its proper divisors (4863357).

9981603 is a wasteful number, since it uses less digits than its factorization.

9981603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443 (or 1437 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 9981603 is about 3159.3674999911. The cubic root of 9981603 is about 215.3112707850.

It can be divided in two parts, 998 and 1603, that added together give a square (2601 = 51²).

The spelling of 9981603 in words is "nine million, nine hundred eighty-one thousand, six hundred three".