11311322231 has 16 divisors (see below), whose sum is σ = 12992883840. Its totient is φ = 9738954720.

The previous prime is 11311322219. The next prime is 11311322263. The reversal of 11311322231 is 13222311311.

It is a happy number.

It is not a de Polignac number, because 11311322231 - 2¹⁴ = 11311305847 is a prime.

It is a super-2 number, since 2×11311322231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311352231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1033916 + ... + 1044798.

It is an arithmetic number, because the mean of its divisors is an integer number (812055240).

Almost surely, 2^11311322231 is an apocalyptic number.

11311322231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11311322231 is a deficient number, since it is larger than the sum of its proper divisors (1681561609).

11311322231 is a wasteful number, since it uses less digits than its factorization.

11311322231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15886.

The product of its digits is 216, while the sum is 20.

Adding to 11311322231 its reverse (13222311311), we get a palindrome (24533633542).

The spelling of 11311322231 in words is "eleven billion, three hundred eleven million, three hundred twenty-two thousand, two hundred thirty-one".