2091013 has 4 divisors (see below), whose sum is σ = 2095020. Its totient is φ = 2087008.

The previous prime is 2090989. The next prime is 2091053. The reversal of 2091013 is 3101902.

2091013 = 1022² + 1023².

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

It can be written as a sum of positive squares in 2 ways, for example, as 1044484 + 1046529 = 1022^2 + 1023^2 .

It is a 3-Lehmer number, since φ(2091013) divides (2091013-1)³.

It is a cyclic number.

It is not a de Polignac number, because 2091013 - 2¹⁷ = 1959941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078 + ... + 2311.

It is an arithmetic number, because the mean of its divisors is an integer number (523755).

2^2091013 is an apocalyptic number.

2091013 is the 1023-rd centered square number.

It is an amenable number.

2091013 is a deficient number, since it is larger than the sum of its proper divisors (4007).

2091013 is an equidigital number, since it uses as much as digits as its factorization.

2091013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006.

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

The square root of 2091013 is about 1446.0335404132. The cubic root of 2091013 is about 127.8749796550.

Adding to 2091013 its reverse (3101902), we get a palindrome (5192915).

The spelling of 2091013 in words is "two million, ninety-one thousand, thirteen".