1131230257 has 2 divisors, whose sum is σ = 1131230258. Its totient is φ = 1131230256.

The previous prime is 1131230249. The next prime is 1131230293. The reversal of 1131230257 is 7520321311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 899460081 + 231770176 = 29991^2 + 15224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131230257 - 2³ = 1131230249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131230957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565615128 + 565615129.

It is an arithmetic number, because the mean of its divisors is an integer number (565615129).

Almost surely, 2^1131230257 is an apocalyptic number.

It is an amenable number.

1131230257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131230257 is an equidigital number, since it uses as much as digits as its factorization.

1131230257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1131230257 is about 33633.7666192771. The cubic root of 1131230257 is about 1041.9582977405.

Adding to 1131230257 its reverse (7520321311), we get a palindrome (8651551568).

The spelling of 1131230257 in words is "one billion, one hundred thirty-one million, two hundred thirty thousand, two hundred fifty-seven".