1131031231 has 4 divisors (see below), whose sum is σ = 1233852264. Its totient is φ = 1028210200.

The previous prime is 1131031219. The next prime is 1131031241. The reversal of 1131031231 is 1321301311.

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 1131031231 - 2⁷ = 1131031103 is a prime.

It is a super-2 number, since 2×1131031231² = 2558463290994750722, 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 (1131031241) 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, 51410500 + ... + 51410521.

It is an arithmetic number, because the mean of its divisors is an integer number (308463066).

Almost surely, 2^1131031231 is an apocalyptic number.

1131031231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1131031231 is a deficient number, since it is larger than the sum of its proper divisors (102821033).

1131031231 is a wasteful number, since it uses less digits than its factorization.

1131031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102821032.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1131031231 is about 33630.8077660945. The cubic root of 1131031231 is about 1041.8971875896.

Adding to 1131031231 its reverse (1321301311), we get a palindrome (2452332542).

The spelling of 1131031231 in words is "one billion, one hundred thirty-one million, thirty-one thousand, two hundred thirty-one".