2691005 has 4 divisors (see below), whose sum is σ = 3229212. Its totient is φ = 2152800.

The previous prime is 2691001. The next prime is 2691011. The reversal of 2691005 is 5001962.

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 1138489 + 1552516 = 1067^2 + 1246^2 .

It is not a de Polignac number, because 2691005 - 2² = 2691001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691001) 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, 269096 + ... + 269105.

It is an arithmetic number, because the mean of its divisors is an integer number (807303).

2^2691005 is an apocalyptic number.

It is an amenable number.

2691005 is a deficient number, since it is larger than the sum of its proper divisors (538207).

2691005 is an equidigital number, since it uses as much as digits as its factorization.

2691005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538206.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2691005 is about 1640.4282977320. The cubic root of 2691005 is about 139.0928592977.

Adding to 2691005 its reverse (5001962), we get a palindrome (7692967).

The spelling of 2691005 in words is "two million, six hundred ninety-one thousand, five".