1131806237 has 2 divisors, whose sum is σ = 1131806238. Its totient is φ = 1131806236.

The previous prime is 1131806191. The next prime is 1131806257. The reversal of 1131806237 is 7326081311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 949934041 + 181872196 = 30821^2 + 13486^2 .

It is an emirp because it is prime and its reverse (7326081311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131806237 - 2¹⁸ = 1131544093 is a prime.

It is a super-2 number, since 2×1131806237² = 2561970716224200338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131806257) 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, 565903118 + 565903119.

It is an arithmetic number, because the mean of its divisors is an integer number (565903119).

Almost surely, 2^1131806237 is an apocalyptic number.

It is an amenable number.

1131806237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131806237 is an equidigital number, since it uses as much as digits as its factorization.

1131806237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1131806237 is about 33642.3280555909. The cubic root of 1131806237 is about 1042.1351097579.

Adding to 1131806237 its reverse (7326081311), we get a palindrome (8457887548).

The spelling of 1131806237 in words is "one billion, one hundred thirty-one million, eight hundred six thousand, two hundred thirty-seven".