1131313237 has 2 divisors, whose sum is σ = 1131313238. Its totient is φ = 1131313236.

The previous prime is 1131313201. The next prime is 1131313283. The reversal of 1131313237 is 7323131311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676728196 + 454585041 = 26014^2 + 21321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131313237 is a prime.

It is a super-2 number, since 2×1131313237² = 2559739280422836338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131313837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565656618 + 565656619.

It is an arithmetic number, because the mean of its divisors is an integer number (565656619).

Almost surely, 2^1131313237 is an apocalyptic number.

It is an amenable number.

1131313237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131313237 is an equidigital number, since it uses as much as digits as its factorization.

1131313237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 25.

The square root of 1131313237 is about 33635.0001783856. Note that the first 3 decimals coincide. The cubic root of 1131313237 is about 1041.9837743061.

Adding to 1131313237 its reverse (7323131311), we get a palindrome (8454444548).

The spelling of 1131313237 in words is "one billion, one hundred thirty-one million, three hundred thirteen thousand, two hundred thirty-seven".