99981603 has 24 divisors (see below), whose sum is σ = 151149440. Its totient is φ = 63607680.

The previous prime is 99981601. The next prime is 99981613. The reversal of 99981603 is 30618999.

It is not a de Polignac number, because 99981603 - 2¹ = 99981601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99981601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17913 + ... + 22821.

Almost surely, 2^99981603 is an apocalyptic number.

99981603 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

99981603 is a deficient number, since it is larger than the sum of its proper divisors (51167837).

99981603 is a wasteful number, since it uses less digits than its factorization.

99981603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019 (or 5016 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 99981603 is about 9999.0801076899. The cubic root of 99981603 is about 464.1304178457.

The spelling of 99981603 in words is "ninety-nine million, nine hundred eighty-one thousand, six hundred three".