961889 has 4 divisors (see below), whose sum is σ = 987924. Its totient is φ = 935856.

The previous prime is 961879. The next prime is 961927. The reversal of 961889 is 988169.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478864 + 483025 = 692^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 961889 - 2⁸ = 961633 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12962 + ... + 13035.

It is an arithmetic number, because the mean of its divisors is an integer number (246981).

2⁹⁶¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

961889 is a deficient number, since it is larger than the sum of its proper divisors (26035).

961889 is a wasteful number, since it uses less digits than its factorization.

961889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26034.

The product of its digits is 31104, while the sum is 41.

The square root of 961889 is about 980.7593996491. The cubic root of 961889 is about 98.7131443941.

The spelling of 961889 in words is "nine hundred sixty-one thousand, eight hundred eighty-nine".