981099 has 32 divisors (see below), whose sum is σ = 1728000. Its totient is φ = 538272.

The previous prime is 981091. The next prime is 981133. The reversal of 981099 is 990189.

It is not a de Polignac number, because 981099 - 2³ = 981091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5392 + ... + 5570.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2⁹⁸¹⁰⁹⁹ is an apocalyptic number.

981099 is a deficient number, since it is larger than the sum of its proper divisors (746901).

981099 is a wasteful number, since it uses less digits than its factorization.

981099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 981099 is about 990.5044169513. The cubic root of 981099 is about 99.3659550329.

The spelling of 981099 in words is "nine hundred eighty-one thousand, ninety-nine".