11391535876 has 72 divisors (see below), whose sum is σ = 24029162136. Its totient is φ = 4707763200.

The previous prime is 11391535853. The next prime is 11391535927. The reversal of 11391535876 is 67853519311.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2285796100 + 9105739776 = 47810^2 + 95424^2 .

It is a super-2 number, since 2×11391535876² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 812526 + ... + 826426.

It is an arithmetic number, because the mean of its divisors is an integer number (333738363).

Almost surely, 2^11391535876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11391535876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12014581068).

11391535876 is an abundant number, since it is smaller than the sum of its proper divisors (12637626260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11391535876 is a wasteful number, since it uses less digits than its factorization.

11391535876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14069 (or 14060 counting only the distinct ones).

The product of its digits is 680400, while the sum is 49.

The spelling of 11391535876 in words is "eleven billion, three hundred ninety-one million, five hundred thirty-five thousand, eight hundred seventy-six".