11820767281 has 4 divisors (see below), whose sum is σ = 11821465600. Its totient is φ = 11820068964.

The previous prime is 11820767261. The next prime is 11820767317. The reversal of 11820767281 is 18276702811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11820767281 - 2²⁵ = 11787212849 is a prime.

It is a super-2 number, since 2×11820767281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11820767221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323121 + ... + 357838.

It is an arithmetic number, because the mean of its divisors is an integer number (2955366400).

Almost surely, 2^11820767281 is an apocalyptic number.

It is an amenable number.

11820767281 is a deficient number, since it is larger than the sum of its proper divisors (698319).

11820767281 is an equidigital number, since it uses as much as digits as its factorization.

11820767281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698318.

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 11820767281 in words is "eleven billion, eight hundred twenty million, seven hundred sixty-seven thousand, two hundred eighty-one".