981663 has 16 divisors (see below), whose sum is σ = 1403136. Its totient is φ = 608960.

The previous prime is 981653. The next prime is 981683. The reversal of 981663 is 366189.

It is a cyclic number.

It is not a de Polignac number, because 981663 - 2⁶ = 981599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2656 + ... + 3002.

It is an arithmetic number, because the mean of its divisors is an integer number (87696).

2⁹⁸¹⁶⁶³ is an apocalyptic number.

981663 is a deficient number, since it is larger than the sum of its proper divisors (421473).

981663 is a wasteful number, since it uses less digits than its factorization.

981663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

The product of its digits is 7776, while the sum is 33.

The square root of 981663 is about 990.7890794715. The cubic root of 981663 is about 99.3849920731.

The spelling of 981663 in words is "nine hundred eighty-one thousand, six hundred sixty-three".