2171091 has 16 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 1324320.

The previous prime is 2171089. The next prime is 2171101. The reversal of 2171091 is 1901712.

It is not a de Polignac number, because 2171091 - 2¹ = 2171089 is a prime.

It is a super-2 number, since 2×2171091² = 9427272260562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2171011) 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, 6826 + ... + 7136.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

2^2171091 is an apocalyptic number.

2171091 is a deficient number, since it is larger than the sum of its proper divisors (973869).

2171091 is a wasteful number, since it uses less digits than its factorization.

2171091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506.

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

The square root of 2171091 is about 1473.4622492619. The cubic root of 2171091 is about 129.4869522689.

The spelling of 2171091 in words is "two million, one hundred seventy-one thousand, ninety-one".