1113531231 has 4 divisors (see below), whose sum is σ = 1484708312. Its totient is φ = 742354152.

The previous prime is 1113531203. The next prime is 1113531257. The reversal of 1113531231 is 1321353111.

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

It is not a de Polignac number, because 1113531231 - 2¹³ = 1113523039 is a prime.

It is a super-2 number, since 2×1113531231² = 2479903604824750722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1113531198 and 1113531207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113535231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185588536 + ... + 185588541.

It is an arithmetic number, because the mean of its divisors is an integer number (371177078).

Almost surely, 2^1113531231 is an apocalyptic number.

1113531231 is a deficient number, since it is larger than the sum of its proper divisors (371177081).

1113531231 is an equidigital number, since it uses as much as digits as its factorization.

1113531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371177080.

The product of its digits is 270, while the sum is 21.

The square root of 1113531231 is about 33369.6153858566. The cubic root of 1113531231 is about 1036.4956108597.

Adding to 1113531231 its reverse (1321353111), we get a palindrome (2434884342).

The spelling of 1113531231 in words is "one billion, one hundred thirteen million, five hundred thirty-one thousand, two hundred thirty-one".