2691126805 has 4 divisors (see below), whose sum is σ = 3229352172. Its totient is φ = 2152901440.

The previous prime is 2691126793. The next prime is 2691126811. The reversal of 2691126805 is 5086211962.

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 862538161 + 1828588644 = 29369^2 + 42762^2 .

It is not a de Polignac number, because 2691126805 - 2¹¹ = 2691124757 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269112676 + ... + 269112685.

It is an arithmetic number, because the mean of its divisors is an integer number (807338043).

Almost surely, 2^2691126805 is an apocalyptic number.

It is an amenable number.

2691126805 is a deficient number, since it is larger than the sum of its proper divisors (538225367).

2691126805 is an equidigital number, since it uses as much as digits as its factorization.

2691126805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538225366.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 2691126805 is about 51876.0716033896. The cubic root of 2691126805 is about 1390.9495788787.

The spelling of 2691126805 in words is "two billion, six hundred ninety-one million, one hundred twenty-six thousand, eight hundred five".