2106591 has 8 divisors (see below), whose sum is σ = 2862000. Its totient is φ = 1377792.

The previous prime is 2106563. The next prime is 2106617. The reversal of 2106591 is 1956012.

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

It is not a de Polignac number, because 2106591 - 2⁷ = 2106463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106551) 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, 6466 + ... + 6783.

It is an arithmetic number, because the mean of its divisors is an integer number (357750).

2^2106591 is an apocalyptic number.

2106591 is a deficient number, since it is larger than the sum of its proper divisors (755409).

2106591 is a wasteful number, since it uses less digits than its factorization.

2106591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13305.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 2106591 is about 1451.4100040995. The cubic root of 2106591 is about 128.1917495540.

The spelling of 2106591 in words is "two million, one hundred six thousand, five hundred ninety-one".