11431134431 has 4 divisors (see below), whose sum is σ = 11451657672. Its totient is φ = 11410611192.

The previous prime is 11431134359. The next prime is 11431134433. The reversal of 11431134431 is 13443113411.

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 11431134431 - 2¹⁴ = 11431118047 is a prime.

It is a super-2 number, since 2×11431134431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11431134431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11431134433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10260785 + ... + 10261898.

It is an arithmetic number, because the mean of its divisors is an integer number (2862914418).

Almost surely, 2^11431134431 is an apocalyptic number.

11431134431 is a deficient number, since it is larger than the sum of its proper divisors (20523241).

11431134431 is an equidigital number, since it uses as much as digits as its factorization.

11431134431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523240.

The product of its digits is 1728, while the sum is 26.

Adding to 11431134431 its reverse (13443113411), we get a palindrome (24874247842).

The spelling of 11431134431 in words is "eleven billion, four hundred thirty-one million, one hundred thirty-four thousand, four hundred thirty-one".