11047930781 has 4 divisors (see below), whose sum is σ = 11051126364. Its totient is φ = 11044735200.

The previous prime is 11047930771. The next prime is 11047930783. The reversal of 11047930781 is 18703974011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18703974011 = 9349 ⋅2000639.

It can be written as a sum of positive squares in 2 ways, for example, as 2198765881 + 8849164900 = 46891^2 + 94070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11047930781 is a prime.

It is a super-2 number, since 2×11047930781² (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 (11047930783) 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, 1592600 + ... + 1599521.

It is an arithmetic number, because the mean of its divisors is an integer number (2762781591).

Almost surely, 2^11047930781 is an apocalyptic number.

It is an amenable number.

11047930781 is a deficient number, since it is larger than the sum of its proper divisors (3195583).

11047930781 is an equidigital number, since it uses as much as digits as its factorization.

11047930781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195582.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 11047930781 in words is "eleven billion, forty-seven million, nine hundred thirty thousand, seven hundred eighty-one".