11539043431 has 4 divisors (see below), whose sum is σ = 11627127864. Its totient is φ = 11450959000.

The previous prime is 11539043423. The next prime is 11539043449. The reversal of 11539043431 is 13434093511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13434093511 = 16529 ⋅812759.

It is a cyclic number.

It is not a de Polignac number, because 11539043431 - 2³ = 11539043423 is a prime.

It is a super-2 number, since 2×11539043431² (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 (11539043491) 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, 44042020 + ... + 44042281.

It is an arithmetic number, because the mean of its divisors is an integer number (2906781966).

Almost surely, 2^11539043431 is an apocalyptic number.

11539043431 is a deficient number, since it is larger than the sum of its proper divisors (88084433).

11539043431 is an equidigital number, since it uses as much as digits as its factorization.

11539043431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88084432.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 11539043431 in words is "eleven billion, five hundred thirty-nine million, forty-three thousand, four hundred thirty-one".