11323440431 has 48 divisors (see below), whose sum is σ = 12880604160. Its totient is φ = 9929874240.

The previous prime is 11323440409. The next prime is 11323440437. The reversal of 11323440431 is 13404432311.

It is a happy number.

It is not a de Polignac number, because 11323440431 - 2⁶ = 11323440367 is a prime.

It is a super-2 number, since 2×11323440431² (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 11323440431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11323440437) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40012016 + ... + 40012298.

It is an arithmetic number, because the mean of its divisors is an integer number (268345920).

Almost surely, 2^11323440431 is an apocalyptic number.

11323440431 is a deficient number, since it is larger than the sum of its proper divisors (1557163729).

11323440431 is a wasteful number, since it uses less digits than its factorization.

11323440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 11323440431 its reverse (13404432311), we get a palindrome (24727872742).

The spelling of 11323440431 in words is "eleven billion, three hundred twenty-three million, four hundred forty thousand, four hundred thirty-one".