11431131431 has 4 divisors (see below), whose sum is σ = 11559571200. Its totient is φ = 11302691664.

The previous prime is 11431131427. The next prime is 11431131433. The reversal of 11431131431 is 13413113411.

11431131431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11431131431 - 2² = 11431131427 is a prime.

It is a super-2 number, since 2×11431131431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11431131397 and 11431131406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11431131433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64219751 + ... + 64219928.

It is an arithmetic number, because the mean of its divisors is an integer number (2889892800).

Almost surely, 2^11431131431 is an apocalyptic number.

11431131431 is a deficient number, since it is larger than the sum of its proper divisors (128439769).

11431131431 is an equidigital number, since it uses as much as digits as its factorization.

11431131431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128439768.

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

Adding to 11431131431 its reverse (13413113411), we get a palindrome (24844244842).

The spelling of 11431131431 in words is "eleven billion, four hundred thirty-one million, one hundred thirty-one thousand, four hundred thirty-one".