2128961 has 8 divisors (see below), whose sum is σ = 2292264. Its totient is φ = 1969920.

The previous prime is 2128933. The next prime is 2128963. The reversal of 2128961 is 1698212.

It can be written as a sum of positive squares in 4 ways, for example, as 126736 + 2002225 = 356^2 + 1415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128961 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (2128963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (286533).

2^2128961 is an apocalyptic number.

It is an amenable number.

2128961 is a deficient number, since it is larger than the sum of its proper divisors (163303).

2128961 is a wasteful number, since it uses less digits than its factorization.

2128961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131.

The product of its digits is 1728, while the sum is 29.

The square root of 2128961 is about 1459.0959529791. The cubic root of 2128961 is about 128.6439110995.

It can be divided in two parts, 21 and 28961, that added together give a palindrome (28982).

The spelling of 2128961 in words is "two million, one hundred twenty-eight thousand, nine hundred sixty-one".