11311215641 has 12 divisors (see below), whose sum is σ = 13087359600. Its totient is φ = 9741714840.

The previous prime is 11311215637. The next prime is 11311215653. The reversal of 11311215641 is 14651211311.

It is not a de Polignac number, because 11311215641 - 2² = 11311215637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11311215641.

It is not an unprimeable number, because it can be changed into a prime (11311215631) 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, 2457731 + ... + 2462328.

It is an arithmetic number, because the mean of its divisors is an integer number (1090613300).

Almost surely, 2^11311215641 is an apocalyptic number.

11311215641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11311215641 is a deficient number, since it is larger than the sum of its proper divisors (1776143959).

11311215641 is a wasteful number, since it uses less digits than its factorization.

11311215641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920100 (or 4920089 counting only the distinct ones).

The product of its digits is 720, while the sum is 26.

Adding to 11311215641 its reverse (14651211311), we get a palindrome (25962426952).

The spelling of 11311215641 in words is "eleven billion, three hundred eleven million, two hundred fifteen thousand, six hundred forty-one".