11528691581 has 16 divisors (see below), whose sum is σ = 13097808000. Its totient is φ = 10051272000.

The previous prime is 11528691571. The next prime is 11528691589. The reversal of 11528691581 is 18519682511.

It is a de Polignac number, because none of the positive numbers 2^k-11528691581 is a prime.

It is a super-2 number, since 2×11528691581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11528691589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73745 + ... + 168806.

It is an arithmetic number, because the mean of its divisors is an integer number (818613000).

Almost surely, 2^11528691581 is an apocalyptic number.

11528691581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11528691581 is a deficient number, since it is larger than the sum of its proper divisors (1569116419).

11528691581 is a wasteful number, since it uses less digits than its factorization.

11528691581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242740.

The product of its digits is 172800, while the sum is 47.

The spelling of 11528691581 in words is "eleven billion, five hundred twenty-eight million, six hundred ninety-one thousand, five hundred eighty-one".