1151812231 has 2 divisors, whose sum is σ = 1151812232. Its totient is φ = 1151812230.

The previous prime is 1151812213. The next prime is 1151812247. The reversal of 1151812231 is 1322181511.

Together with previous prime (1151812213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1151812231 is a prime.

It is a super-2 number, since 2×1151812231² = 2653342830962394722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1151812196 and 1151812205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151872231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575906115 + 575906116.

It is an arithmetic number, because the mean of its divisors is an integer number (575906116).

Almost surely, 2^1151812231 is an apocalyptic number.

1151812231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151812231 is an equidigital number, since it uses as much as digits as its factorization.

1151812231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 25.

The square root of 1151812231 is about 33938.3592856225. The cubic root of 1151812231 is about 1048.2395992658.

Adding to 1151812231 its reverse (1322181511), we get a palindrome (2473993742).

The spelling of 1151812231 in words is "one billion, one hundred fifty-one million, eight hundred twelve thousand, two hundred thirty-one".