11355113531 has 4 divisors (see below), whose sum is σ = 11746669200. Its totient is φ = 10963557864.

The previous prime is 11355113521. The next prime is 11355113543. The reversal of 11355113531 is 13531155311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11355113531 - 2¹⁰ = 11355112507 is a prime.

It is a super-2 number, since 2×11355113531² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 391555639 = 11355113531 / (1 + 1 + 3 + 5 + 5 + 1 + 1 + 3 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11355113494 and 11355113503.

It is not an unprimeable number, because it can be changed into a prime (11355113521) 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, 195777791 + ... + 195777848.

It is an arithmetic number, because the mean of its divisors is an integer number (2936667300).

Almost surely, 2^11355113531 is an apocalyptic number.

11355113531 is a deficient number, since it is larger than the sum of its proper divisors (391555669).

11355113531 is an equidigital number, since it uses as much as digits as its factorization.

11355113531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391555668.

The product of its digits is 3375, while the sum is 29.

Adding to 11355113531 its reverse (13531155311), we get a palindrome (24886268842).

The spelling of 11355113531 in words is "eleven billion, three hundred fifty-five million, one hundred thirteen thousand, five hundred thirty-one".