2091817 has 16 divisors (see below), whose sum is σ = 2609152. Its totient is φ = 1632960.

The previous prime is 2091809. The next prime is 2091839. The reversal of 2091817 is 7181902.

It is not a de Polignac number, because 2091817 - 2³ = 2091809 is a prime.

It is a super-2 number, since 2×2091817² = 8751396722978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2091847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11467 + ... + 11647.

It is an arithmetic number, because the mean of its divisors is an integer number (163072).

2^2091817 is an apocalyptic number.

It is an amenable number.

2091817 is a deficient number, since it is larger than the sum of its proper divisors (517335).

2091817 is a wasteful number, since it uses less digits than its factorization.

2091817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2091817 is about 1446.3115155457. The cubic root of 2091817 is about 127.8913669769.

The spelling of 2091817 in words is "two million, ninety-one thousand, eight hundred seventeen".