2081731 has 4 divisors (see below), whose sum is σ = 2138032. Its totient is φ = 2025432.

The previous prime is 2081719. The next prime is 2081749. The reversal of 2081731 is 1371802.

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 2081731 - 2⁷ = 2081603 is a prime.

It is a super-2 number, since 2×2081731² = 8667207912722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (2081831) 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, 28095 + ... + 28168.

It is an arithmetic number, because the mean of its divisors is an integer number (534508).

2^2081731 is an apocalyptic number.

2081731 is a deficient number, since it is larger than the sum of its proper divisors (56301).

2081731 is an equidigital number, since it uses as much as digits as its factorization.

2081731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56300.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 2081731 is about 1442.8205016564. The cubic root of 2081731 is about 127.6854867835.

The spelling of 2081731 in words is "two million, eighty-one thousand, seven hundred thirty-one".