11383781517 has 12 divisors (see below), whose sum is σ = 16495778364. Its totient is φ = 7564939200.

The previous prime is 11383781503. The next prime is 11383781573. The reversal of 11383781517 is 71518738311.

It can be written as a sum of positive squares in 2 ways, for example, as 218477961 + 11165303556 = 14781^2 + 105666^2 .

It is not a de Polignac number, because 11383781517 - 2⁴ = 11383781501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11383789517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2017734 + ... + 2023367.

It is an arithmetic number, because the mean of its divisors is an integer number (1374648197).

Almost surely, 2^11383781517 is an apocalyptic number.

It is an amenable number.

11383781517 is a deficient number, since it is larger than the sum of its proper divisors (5111996847).

11383781517 is a wasteful number, since it uses less digits than its factorization.

11383781517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041420 (or 4041417 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The spelling of 11383781517 in words is "eleven billion, three hundred eighty-three million, seven hundred eighty-one thousand, five hundred seventeen".