2991105 has 24 divisors (see below), whose sum is σ = 5584488. Its totient is φ = 1472256.

The previous prime is 2991103. The next prime is 2991139. The reversal of 2991105 is 5011992.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 138384 + 2852721 = 372^2 + 1689^2 .

It is not a de Polignac number, because 2991105 - 2¹ = 2991103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1972 + ... + 3141.

It is an arithmetic number, because the mean of its divisors is an integer number (232687).

2^2991105 is an apocalyptic number.

It is an amenable number.

2991105 is a deficient number, since it is larger than the sum of its proper divisors (2593383).

2991105 is a wasteful number, since it uses less digits than its factorization.

2991105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137 (or 5134 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 2991105 is about 1729.4811360636. The cubic root of 2991105 is about 144.0822735864.

The spelling of 2991105 in words is "two million, nine hundred ninety-one thousand, one hundred five".