1131404231 has 4 divisors (see below), whose sum is σ = 1170418200. Its totient is φ = 1092390264.

The previous prime is 1131404189. The next prime is 1131404243. The reversal of 1131404231 is 1324041311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1324041311 = 17 ⋅77884783.

It is a cyclic number.

It is not a de Polignac number, because 1131404231 - 2¹⁸ = 1131142087 is a prime.

It is a super-2 number, since 2×1131404231² = 2560151067849402722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131409231) 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, 19506941 + ... + 19506998.

It is an arithmetic number, because the mean of its divisors is an integer number (292604550).

Almost surely, 2^1131404231 is an apocalyptic number.

1131404231 is a deficient number, since it is larger than the sum of its proper divisors (39013969).

1131404231 is an equidigital number, since it uses as much as digits as its factorization.

1131404231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39013968.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1131404231 is about 33636.3528195314. The cubic root of 1131404231 is about 1042.0117099024.

Adding to 1131404231 its reverse (1324041311), we get a palindrome (2455445542).

The spelling of 1131404231 in words is "one billion, one hundred thirty-one million, four hundred four thousand, two hundred thirty-one".