2091081331 has 2 divisors, whose sum is σ = 2091081332. Its totient is φ = 2091081330.

The previous prime is 2091081329. The next prime is 2091081341. The reversal of 2091081331 is 1331801902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2091081331 - 2¹ = 2091081329 is a prime.

It is a super-2 number, since 2×2091081331² = 8745242265713463122, which contains 22 as substring.

Together with 2091081329, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2091081331.

It is not a weakly prime, because it can be changed into another prime (2091081341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045540665 + 1045540666.

It is an arithmetic number, because the mean of its divisors is an integer number (1045540666).

Almost surely, 2^2091081331 is an apocalyptic number.

2091081331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091081331 is an equidigital number, since it uses as much as digits as its factorization.

2091081331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 2091081331 is about 45728.3427537015. The cubic root of 2091081331 is about 1278.7637255720.

The spelling of 2091081331 in words is "two billion, ninety-one million, eighty-one thousand, three hundred thirty-one".