11205441531 has 8 divisors (see below), whose sum is σ = 16600654160. Its totient is φ = 7470294336.

The previous prime is 11205441517. The next prime is 11205441547. The reversal of 11205441531 is 13514450211.

11205441531 is a `hidden beast` number, since 1 + 120 + 5 + 4 + 4 + 1 + 531 = 666.

It is not a de Polignac number, because 11205441531 - 2⁹ = 11205441019 is a prime.

It is a super-2 number, since 2×11205441531² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 415016353 = 11205441531 / (1 + 1 + 2 + 0 + 5 + 4 + 4 + 1 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11205441495 and 11205441504.

It is not an unprimeable number, because it can be changed into a prime (11205442531) 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, 207508150 + ... + 207508203.

It is an arithmetic number, because the mean of its divisors is an integer number (2075081770).

Almost surely, 2^11205441531 is an apocalyptic number.

11205441531 is a deficient number, since it is larger than the sum of its proper divisors (5395212629).

11205441531 is an equidigital number, since it uses as much as digits as its factorization.

11205441531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415016362 (or 415016356 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 11205441531 its reverse (13514450211), we get a palindrome (24719891742).

The spelling of 11205441531 in words is "eleven billion, two hundred five million, four hundred forty-one thousand, five hundred thirty-one".