2086581 has 16 divisors (see below), whose sum is σ = 3229184. Its totient is φ = 1173744.

The previous prime is 2086577. The next prime is 2086589. The reversal of 2086581 is 1856802.

It is not a de Polignac number, because 2086581 - 2² = 2086577 is a prime.

It is a super-2 number, since 2×2086581² = 8707640539122, which contains 22 as substring.

It is the 1445-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2086589) by changing a digit.

It is a nontrivial repunit in base 1444.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666 + ... + 2148.

It is an arithmetic number, because the mean of its divisors is an integer number (201824).

2^2086581 is an apocalyptic number.

2086581 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2086581 is a deficient number, since it is larger than the sum of its proper divisors (1142603).

2086581 is a wasteful number, since it uses less digits than its factorization.

2086581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2086581 is about 1444.5002596054. The cubic root of 2086581 is about 127.7845700793.

The spelling of 2086581 in words is "two million, eighty-six thousand, five hundred eighty-one".