11431431311 has 4 divisors (see below), whose sum is σ = 11740388952. Its totient is φ = 11122473672.

The previous prime is 11431431289. The next prime is 11431431313. The reversal of 11431431311 is 11313413411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11313413411 = 397 ⋅28497263.

It is a cyclic number.

It is not a de Polignac number, because 11431431311 - 2³⁰ = 10357689487 is a prime.

It is a super-2 number, since 2×11431431311² (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 (11431431313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154478765 + ... + 154478838.

It is an arithmetic number, because the mean of its divisors is an integer number (2935097238).

Almost surely, 2^11431431311 is an apocalyptic number.

11431431311 is a deficient number, since it is larger than the sum of its proper divisors (308957641).

11431431311 is an equidigital number, since it uses as much as digits as its factorization.

11431431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308957640.

The product of its digits is 432, while the sum is 23.

Adding to 11431431311 its reverse (11313413411), we get a palindrome (22744844722).

The spelling of 11431431311 in words is "eleven billion, four hundred thirty-one million, four hundred thirty-one thousand, three hundred eleven".