1131212237 has 2 divisors, whose sum is σ = 1131212238. Its totient is φ = 1131212236.

The previous prime is 1131212191. The next prime is 1131212273. The reversal of 1131212237 is 7322121311.

Together with next prime (1131212273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998939236 + 132273001 = 31606^2 + 11501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131212237 - 2¹⁴ = 1131195853 is a prime.

It is a super-2 number, since 2×1131212237² = 2559282250277088338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131212287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565606118 + 565606119.

It is an arithmetic number, because the mean of its divisors is an integer number (565606119).

Almost surely, 2^1131212237 is an apocalyptic number.

It is an amenable number.

1131212237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131212237 is an equidigital number, since it uses as much as digits as its factorization.

1131212237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 1131212237 is about 33633.4987326624. The cubic root of 1131212237 is about 1041.9527650654.

Adding to 1131212237 its reverse (7322121311), we get a palindrome (8453333548).

The spelling of 1131212237 in words is "one billion, one hundred thirty-one million, two hundred twelve thousand, two hundred thirty-seven".