2117091 has 8 divisors (see below), whose sum is σ = 2844864. Its totient is φ = 1400360.

The previous prime is 2117077. The next prime is 2117099. The reversal of 2117091 is 1907112.

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

It is a cyclic number.

It is not a de Polignac number, because 2117091 - 2⁹ = 2116579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2117099) 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, 2301 + ... + 3086.

It is an arithmetic number, because the mean of its divisors is an integer number (355608).

2^2117091 is an apocalyptic number.

2117091 is a deficient number, since it is larger than the sum of its proper divisors (727773).

2117091 is a wasteful number, since it uses less digits than its factorization.

2117091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 2117091 is about 1455.0226802356. The cubic root of 2117091 is about 128.4043811162.

Adding to 2117091 its sum of digits (21), we get a palindrome (2117112).

The spelling of 2117091 in words is "two million, one hundred seventeen thousand, ninety-one".