1131511247 has 2 divisors, whose sum is σ = 1131511248. Its totient is φ = 1131511246.

The previous prime is 1131511189. The next prime is 1131511273. The reversal of 1131511247 is 7421151311.

It is an a-pointer prime, because the next prime (1131511273) can be obtained adding 1131511247 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131511247 - 2¹⁰ = 1131510223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131511747) 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 as a sum of consecutive naturals, namely, 565755623 + 565755624.

It is an arithmetic number, because the mean of its divisors is an integer number (565755624).

Almost surely, 2^1131511247 is an apocalyptic number.

1131511247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131511247 is an equidigital number, since it uses as much as digits as its factorization.

1131511247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 26.

The square root of 1131511247 is about 33637.9435608064. The cubic root of 1131511247 is about 1042.0445624133.

Adding to 1131511247 its reverse (7421151311), we get a palindrome (8552662558).

The spelling of 1131511247 in words is "one billion, one hundred thirty-one million, five hundred eleven thousand, two hundred forty-seven".