1217258257 has 2 divisors, whose sum is σ = 1217258258. Its totient is φ = 1217258256.

The previous prime is 1217258249. The next prime is 1217258291. The reversal of 1217258257 is 7528527121.

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., 1185493761 + 31764496 = 34431^2 + 5636^2 .

It is an emirp because it is prime and its reverse (7528527121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1217258257 - 2³ = 1217258249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217258957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608629128 + 608629129.

It is an arithmetic number, because the mean of its divisors is an integer number (608629129).

Almost surely, 2^1217258257 is an apocalyptic number.

It is an amenable number.

1217258257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217258257 is an equidigital number, since it uses as much as digits as its factorization.

1217258257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 40.

The square root of 1217258257 is about 34889.2283806908. The cubic root of 1217258257 is about 1067.7286833537.

The spelling of 1217258257 in words is "one billion, two hundred seventeen million, two hundred fifty-eight thousand, two hundred fifty-seven".