2991305 has 4 divisors (see below), whose sum is σ = 3589572. Its totient is φ = 2393040.

The previous prime is 2991299. The next prime is 2991353. The reversal of 2991305 is 5031992.

2991305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 440896 + 2550409 = 664^2 + 1597^2 .

It is not a de Polignac number, because 2991305 - 2⁸ = 2991049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 299126 + ... + 299135.

It is an arithmetic number, because the mean of its divisors is an integer number (897393).

2^2991305 is an apocalyptic number.

It is an amenable number.

2991305 is a deficient number, since it is larger than the sum of its proper divisors (598267).

2991305 is an equidigital number, since it uses as much as digits as its factorization.

2991305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598266.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 2991305 is about 1729.5389559070. The cubic root of 2991305 is about 144.0854848647.

The spelling of 2991305 in words is "two million, nine hundred ninety-one thousand, three hundred five".