1131806257 has 2 divisors, whose sum is σ = 1131806258. Its totient is φ = 1131806256.

The previous prime is 1131806237. The next prime is 1131806267. The reversal of 1131806257 is 7526081311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690428176 + 441378081 = 26276^2 + 21009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131806257 - 2⁷ = 1131806129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131806237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565903128 + 565903129.

It is an arithmetic number, because the mean of its divisors is an integer number (565903129).

Almost surely, 2^1131806257 is an apocalyptic number.

It is an amenable number.

1131806257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131806257 is an equidigital number, since it uses as much as digits as its factorization.

1131806257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1131806257 is about 33642.3283528355. The cubic root of 1131806257 is about 1042.1351158964.

Adding to 1131806257 its reverse (7526081311), we get a palindrome (8657887568).

The spelling of 1131806257 in words is "one billion, one hundred thirty-one million, eight hundred six thousand, two hundred fifty-seven".