2117261 has 4 divisors (see below), whose sum is σ = 2190300. Its totient is φ = 2044224.

The previous prime is 2117239. The next prime is 2117273. The reversal of 2117261 is 1627112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 722500 + 1394761 = 850^2 + 1181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36476 + ... + 36533.

It is an arithmetic number, because the mean of its divisors is an integer number (547575).

2^2117261 is an apocalyptic number.

It is an amenable number.

2117261 is a deficient number, since it is larger than the sum of its proper divisors (73039).

2117261 is an equidigital number, since it uses as much as digits as its factorization.

2117261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73038.

The product of its digits is 168, while the sum is 20.

The square root of 2117261 is about 1455.0810973963. The cubic root of 2117261 is about 128.4078179328.

The spelling of 2117261 in words is "two million, one hundred seventeen thousand, two hundred sixty-one".