1131133231 has 4 divisors (see below), whose sum is σ = 1136494264. Its totient is φ = 1125772200.

The previous prime is 1131133229. The next prime is 1131133243. The reversal of 1131133231 is 1323311311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1323311311 = 7 ⋅189044473.

It is a cyclic number.

It is not a de Polignac number, because 1131133231 - 2¹ = 1131133229 is a prime.

It is a super-2 number, since 2×1131133231² = 2558924772544998722, 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 = 1131133199 and 1131133208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131133271) 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, 2680200 + ... + 2680621.

It is an arithmetic number, because the mean of its divisors is an integer number (284123566).

Almost surely, 2^1131133231 is an apocalyptic number.

1131133231 is a deficient number, since it is larger than the sum of its proper divisors (5361033).

1131133231 is an equidigital number, since it uses as much as digits as its factorization.

1131133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361032.

The product of its digits is 162, while the sum is 19.

The square root of 1131133231 is about 33632.3241986039. The cubic root of 1131133231 is about 1041.9285071841.

Adding to 1131133231 its reverse (1323311311), we get a palindrome (2454444542).

The spelling of 1131133231 in words is "one billion, one hundred thirty-one million, one hundred thirty-three thousand, two hundred thirty-one".