11531411540 has 96 divisors (see below), whose sum is σ = 27467088768. Its totient is φ = 4029696000.

The previous prime is 11531411539. The next prime is 11531411687. The reversal of 11531411540 is 4511413511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 594800 + ... + 613880.

It is an arithmetic number, because the mean of its divisors is an integer number (286115508).

Almost surely, 2^11531411540 is an apocalyptic number.

11531411540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11531411540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13733544384).

11531411540 is an abundant number, since it is smaller than the sum of its proper divisors (15935677228).

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

11531411540 is a wasteful number, since it uses less digits than its factorization.

11531411540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19209 (or 19207 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 11531411540 in words is "eleven billion, five hundred thirty-one million, four hundred eleven thousand, five hundred forty".