989961 has 32 divisors (see below), whose sum is σ = 1658880. Its totient is φ = 512256.

The previous prime is 989959. The next prime is 989971. The reversal of 989961 is 169989.

989961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 989961 - 2¹ = 989959 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989961.

It is not an unprimeable number, because it can be changed into a prime (989921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16750 + ... + 16808.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁹⁸⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

989961 is a deficient number, since it is larger than the sum of its proper divisors (668919).

989961 is a wasteful number, since it uses less digits than its factorization.

989961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133.

The product of its digits is 34992, while the sum is 42.

The square root of 989961 is about 994.9678386762. The cubic root of 989961 is about 99.6642405845.

The spelling of 989961 in words is "nine hundred eighty-nine thousand, nine hundred sixty-one".