2091031 has 4 divisors (see below), whose sum is σ = 2106432. Its totient is φ = 2075632.

The previous prime is 2090989. The next prime is 2091053. The reversal of 2091031 is 1301902.

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 2091031 - 2¹⁹ = 1566743 is a prime.

It is a super-2 number, since 2×2091031² = 8744821285922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2090996 and 2091014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091431) 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, 7495 + ... + 7768.

It is an arithmetic number, because the mean of its divisors is an integer number (526608).

2^2091031 is an apocalyptic number.

2091031 is a deficient number, since it is larger than the sum of its proper divisors (15401).

2091031 is a wasteful number, since it uses less digits than its factorization.

2091031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15400.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 2091031 is about 1446.0397643219. The cubic root of 2091031 is about 127.8753465813.

Adding to 2091031 its reverse (1301902), we get a palindrome (3392933).

The spelling of 2091031 in words is "two million, ninety-one thousand, thirty-one".