11135431331 has 4 divisors (see below), whose sum is σ = 11292268464. Its totient is φ = 10978594200.

The previous prime is 11135431297. The next prime is 11135431369. The reversal of 11135431331 is 13313453111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13313453111 = 7 ⋅1901921873.

It is a cyclic number.

It is not a de Polignac number, because 11135431331 - 2⁶ = 11135431267 is a prime.

It is a super-2 number, since 2×11135431331² (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 11135431331.

It is not an unprimeable number, because it can be changed into a prime (11135431831) 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, 78418460 + ... + 78418601.

It is an arithmetic number, because the mean of its divisors is an integer number (2823067116).

Almost surely, 2^11135431331 is an apocalyptic number.

11135431331 is a deficient number, since it is larger than the sum of its proper divisors (156837133).

11135431331 is an equidigital number, since it uses as much as digits as its factorization.

11135431331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156837132.

The product of its digits is 1620, while the sum is 26.

Adding to 11135431331 its reverse (13313453111), we get a palindrome (24448884442).

The spelling of 11135431331 in words is "eleven billion, one hundred thirty-five million, four hundred thirty-one thousand, three hundred thirty-one".