11840147581 has 4 divisors (see below), whose sum is σ = 11840780700. Its totient is φ = 11839514464.

The previous prime is 11840147537. The next prime is 11840147591. The reversal of 11840147581 is 18574104811.

11840147581 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 3084802681 + 8755344900 = 55541^2 + 93570^2 .

It is a cyclic number.

It is not a de Polignac number, because 11840147581 - 2¹⁷ = 11840016509 is a prime.

It is a super-2 number, since 2×11840147581² (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 (11840147591) by changing a digit.

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, 287626 + ... + 326203.

It is an arithmetic number, because the mean of its divisors is an integer number (2960195175).

Almost surely, 2^11840147581 is an apocalyptic number.

It is an amenable number.

11840147581 is a deficient number, since it is larger than the sum of its proper divisors (633119).

11840147581 is an equidigital number, since it uses as much as digits as its factorization.

11840147581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633118.

The product of its (nonzero) digits is 35840, while the sum is 40.

The spelling of 11840147581 in words is "eleven billion, eight hundred forty million, one hundred forty-seven thousand, five hundred eighty-one".