11988279361 has 4 divisors (see below), whose sum is σ = 11990240212. Its totient is φ = 11986318512.

The previous prime is 11988279353. The next prime is 11988279367. The reversal of 11988279361 is 16397288911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16397288911 = 45293 ⋅362027.

It can be written as a sum of positive squares in 2 ways, for example, as 11029200400 + 959078961 = 105020^2 + 30969^2 .

It is a cyclic number.

It is not a de Polignac number, because 11988279361 - 2³ = 11988279353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11988279367) 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, 971226 + ... + 983491.

It is an arithmetic number, because the mean of its divisors is an integer number (2997560053).

Almost surely, 2^11988279361 is an apocalyptic number.

It is an amenable number.

11988279361 is a deficient number, since it is larger than the sum of its proper divisors (1960851).

11988279361 is an equidigital number, since it uses as much as digits as its factorization.

11988279361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960850.

The product of its digits is 1306368, while the sum is 55.

The spelling of 11988279361 in words is "eleven billion, nine hundred eighty-eight million, two hundred seventy-nine thousand, three hundred sixty-one".