11515381443 has 24 divisors (see below), whose sum is σ = 18264053808. Its totient is φ = 7225334784.

The previous prime is 11515381439. The next prime is 11515381453. The reversal of 11515381443 is 34418351511.

11515381443 is a `hidden beast` number, since 115 + 1 + 538 + 1 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 11515381443 - 2² = 11515381439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11515381398 and 11515381407.

It is not an unprimeable number, because it can be changed into a prime (11515381403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1389646 + ... + 1397907.

It is an arithmetic number, because the mean of its divisors is an integer number (761002242).

Almost surely, 2^11515381443 is an apocalyptic number.

11515381443 is a deficient number, since it is larger than the sum of its proper divisors (6748672365).

11515381443 is an equidigital number, since it uses as much as digits as its factorization.

11515381443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787585 (or 2787573 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The spelling of 11515381443 in words is "eleven billion, five hundred fifteen million, three hundred eighty-one thousand, four hundred forty-three".