11951097205 has 4 divisors (see below), whose sum is σ = 14341316652. Its totient is φ = 9560877760.

The previous prime is 11951097163. The next prime is 11951097211. The reversal of 11951097205 is 50279015911.

11951097205 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 8720197924 + 3230899281 = 93382^2 + 56841^2 .

It is not a de Polignac number, because 11951097205 - 2⁷ = 11951097077 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1195109716 + ... + 1195109725.

It is an arithmetic number, because the mean of its divisors is an integer number (3585329163).

Almost surely, 2^11951097205 is an apocalyptic number.

It is an amenable number.

11951097205 is a deficient number, since it is larger than the sum of its proper divisors (2390219447).

11951097205 is an equidigital number, since it uses as much as digits as its factorization.

11951097205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390219446.

The product of its (nonzero) digits is 28350, while the sum is 40.

The spelling of 11951097205 in words is "eleven billion, nine hundred fifty-one million, ninety-seven thousand, two hundred five".