2170591 has 4 divisors (see below), whose sum is σ = 2192184. Its totient is φ = 2149000.

The previous prime is 2170583. The next prime is 2170603. The reversal of 2170591 is 1950712.

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

It is a cyclic number.

It is not a de Polignac number, because 2170591 - 2³ = 2170583 is a prime.

It is a super-2 number, since 2×2170591² = 9422930578562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10645 + ... + 10846.

It is an arithmetic number, because the mean of its divisors is an integer number (548046).

2^2170591 is an apocalyptic number.

2170591 is a deficient number, since it is larger than the sum of its proper divisors (21593).

2170591 is a wasteful number, since it uses less digits than its factorization.

2170591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21592.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 2170591 is about 1473.2925710802. The cubic root of 2170591 is about 129.4770112689.

The spelling of 2170591 in words is "two million, one hundred seventy thousand, five hundred ninety-one".