961220 has 24 divisors (see below), whose sum is σ = 2174424. Its totient is φ = 354816.

The previous prime is 961201. The next prime is 961241. The reversal of 961220 is 22169.

961220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12544 + 948676 = 112^2 + 974^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 961192 and 961201.

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 961220.

It is an unprimeable number.

961220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (90601).

2⁹⁶¹²²⁰ is an apocalyptic number.

It is an amenable number.

961220 is an abundant number, since it is smaller than the sum of its proper divisors (1213204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

961220 is a wasteful number, since it uses less digits than its factorization.

961220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719 (or 3717 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 961220 is about 980.4182780834. The cubic root of 961220 is about 98.6902538771.

Adding to 961220 its reverse (22169), we get a palindrome (983389).

The spelling of 961220 in words is "nine hundred sixty-one thousand, two hundred twenty".