1131254231 has 2 divisors, whose sum is σ = 1131254232. Its totient is φ = 1131254230.

The previous prime is 1131254221. The next prime is 1131254249. The reversal of 1131254231 is 1324521311.

It is a weak prime.

It is an emirp because it is prime and its reverse (1324521311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131254231 is a prime.

It is a super-2 number, since 2×1131254231² = 2559472270310802722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131254197 and 1131254206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131254221) 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 as a sum of consecutive naturals, namely, 565627115 + 565627116.

It is an arithmetic number, because the mean of its divisors is an integer number (565627116).

Almost surely, 2^1131254231 is an apocalyptic number.

1131254231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131254231 is an equidigital number, since it uses as much as digits as its factorization.

1131254231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1131254231 is about 33634.1230151761. The cubic root of 1131254231 is about 1041.9656583792.

Adding to 1131254231 its reverse (1324521311), we get a palindrome (2455775542).

The spelling of 1131254231 in words is "one billion, one hundred thirty-one million, two hundred fifty-four thousand, two hundred thirty-one".