1131803231 has 4 divisors (see below), whose sum is σ = 1218865032. Its totient is φ = 1044741432.

The previous prime is 1131803227. The next prime is 1131803269. The reversal of 1131803231 is 1323081311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1323081311 = 967 ⋅1368233.

It is a cyclic number.

It is not a de Polignac number, because 1131803231 - 2² = 1131803227 is a prime.

It is a super-2 number, since 2×1131803231² = 2561957107404078722, 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 = 1131803197 and 1131803206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131803291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43530881 + ... + 43530906.

It is an arithmetic number, because the mean of its divisors is an integer number (304716258).

Almost surely, 2^1131803231 is an apocalyptic number.

1131803231 is a deficient number, since it is larger than the sum of its proper divisors (87061801).

1131803231 is an equidigital number, since it uses as much as digits as its factorization.

1131803231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87061800.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1131803231 is about 33642.2833796994. The cubic root of 1131803231 is about 1042.1341871439.

Adding to 1131803231 its reverse (1323081311), we get a palindrome (2454884542).

The spelling of 1131803231 in words is "one billion, one hundred thirty-one million, eight hundred three thousand, two hundred thirty-one".