961989 has 16 divisors (see below), whose sum is σ = 1543680. Its totient is φ = 520560.

The previous prime is 961981. The next prime is 961991. The reversal of 961989 is 989169.

It is not a de Polignac number, because 961989 - 2³ = 961981 is a prime.

It is a super-2 number, since 2×961989² = 1850845672242, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 961989.

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 961989.

It is not an unprimeable number, because it can be changed into a prime (961981) 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, 807 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (96480).

2⁹⁶¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

961989 is a deficient number, since it is larger than the sum of its proper divisors (581691).

961989 is a wasteful number, since it uses less digits than its factorization.

961989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440.

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

The square root of 961989 is about 980.8103792273. The cubic root of 961989 is about 98.7165650842.

The spelling of 961989 in words is "nine hundred sixty-one thousand, nine hundred eighty-nine".