2016961 has 4 divisors (see below), whose sum is σ = 2019924. Its totient is φ = 2014000.

The previous prime is 2016943. The next prime is 2016967. The reversal of 2016961 is 1696102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1696102 = 2 ⋅848051.

It can be written as a sum of positive squares in 2 ways, for example, as 680625 + 1336336 = 825^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 2016961 - 2⁹ = 2016449 is a prime.

It is a Duffinian number.

2016961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2016967) 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, 111 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (504981).

2^2016961 is an apocalyptic number.

It is an amenable number.

2016961 is a deficient number, since it is larger than the sum of its proper divisors (2963).

2016961 is a wasteful number, since it uses less digits than its factorization.

2016961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2016961 is about 1420.1975214737. The cubic root of 2016961 is about 126.3472615872.

The spelling of 2016961 in words is "two million, sixteen thousand, nine hundred sixty-one".