2116261 has 6 divisors (see below), whose sum is σ = 2461830. Its totient is φ = 1813896.

The previous prime is 2116199. The next prime is 2116291. The reversal of 2116261 is 1626112.

It can be written as a sum of positive squares in only one way, i.e., 1223236 + 893025 = 1106^2 + 945^2 .

It is not a de Polignac number, because 2116261 - 2⁹ = 2115749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116291) 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, 21546 + ... + 21643.

It is an arithmetic number, because the mean of its divisors is an integer number (410305).

2^2116261 is an apocalyptic number.

It is an amenable number.

2116261 is a deficient number, since it is larger than the sum of its proper divisors (345569).

2116261 is an equidigital number, since it uses as much as digits as its factorization.

2116261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43203 (or 43196 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 2116261 is about 1454.7374333535. The cubic root of 2116261 is about 128.3875987221.

The spelling of 2116261 in words is "two million, one hundred sixteen thousand, two hundred sixty-one".