11136220531 has 4 divisors (see below), whose sum is σ = 11136720672. Its totient is φ = 11135720392.

The previous prime is 11136220517. The next prime is 11136220547. The reversal of 11136220531 is 13502263111.

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: 13502263111 = 151 ⋅89418961.

It is a cyclic number.

It is not a de Polignac number, because 11136220531 - 2⁵ = 11136220499 is a prime.

It is a super-2 number, since 2×11136220531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11136220496 and 11136220505.

It is not an unprimeable number, because it can be changed into a prime (11136220631) 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, 215035 + ... + 261748.

It is an arithmetic number, because the mean of its divisors is an integer number (2784180168).

Almost surely, 2^11136220531 is an apocalyptic number.

11136220531 is a deficient number, since it is larger than the sum of its proper divisors (500141).

11136220531 is an equidigital number, since it uses as much as digits as its factorization.

11136220531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500140.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 11136220531 its reverse (13502263111), we get a palindrome (24638483642).

The spelling of 11136220531 in words is "eleven billion, one hundred thirty-six million, two hundred twenty thousand, five hundred thirty-one".