11320447781 has 8 divisors (see below), whose sum is σ = 12030920280. Its totient is φ = 10614926848.

The previous prime is 11320447727. The next prime is 11320447837. The reversal of 11320447781 is 18774402311.

It can be written as a sum of positive squares in 4 ways, for example, as 1710566881 + 9609880900 = 41359^2 + 98030^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11320447781 - 2¹⁸ = 11320185637 is a prime.

It is a super-2 number, since 2×11320447781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11320447711) 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 7 ways as a sum of consecutive naturals, for example, 1233176 + ... + 1242321.

It is an arithmetic number, because the mean of its divisors is an integer number (1503865035).

Almost surely, 2^11320447781 is an apocalyptic number.

It is an amenable number.

11320447781 is a deficient number, since it is larger than the sum of its proper divisors (710472499).

11320447781 is a wasteful number, since it uses less digits than its factorization.

11320447781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475783.

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 11320447781 in words is "eleven billion, three hundred twenty million, four hundred forty-seven thousand, seven hundred eighty-one".