11431431236 has 24 divisors (see below), whose sum is σ = 21199593240. Its totient is φ = 5384019200.

The previous prime is 11431431233. The next prime is 11431431241. The reversal of 11431431236 is 63213413411.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1780333636 + 9651097600 = 42194^2 + 98240^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 11431431199 and 11431431208.

It is not an unprimeable number, because it can be changed into a prime (11431431233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1197035 + ... + 1206546.

It is an arithmetic number, because the mean of its divisors is an integer number (883316385).

Almost surely, 2^11431431236 is an apocalyptic number.

It is an amenable number.

11431431236 is a deficient number, since it is larger than the sum of its proper divisors (9768162004).

11431431236 is a wasteful number, since it uses less digits than its factorization.

11431431236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403655 (or 2403653 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

Adding to 11431431236 its reverse (63213413411), we get a palindrome (74644844647).

The spelling of 11431431236 in words is "eleven billion, four hundred thirty-one million, four hundred thirty-one thousand, two hundred thirty-six".