2099961 has 6 divisors (see below), whose sum is σ = 3033290. Its totient is φ = 1399968.

The previous prime is 2099941. The next prime is 2099963. The reversal of 2099961 is 1699902.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 1010025 = 1044^2 + 1005^2 .

It is not a de Polignac number, because 2099961 - 2¹⁰ = 2098937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116656 + ... + 116673.

2^2099961 is an apocalyptic number.

It is an amenable number.

2099961 is a deficient number, since it is larger than the sum of its proper divisors (933329).

2099961 is a wasteful number, since it uses less digits than its factorization.

2099961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233335 (or 233332 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 2099961 is about 1449.1242182781. The cubic root of 2099961 is about 128.0571237544.

The spelling of 2099961 in words is "two million, ninety-nine thousand, nine hundred sixty-one".