1218257 has 2 divisors, whose sum is σ = 1218258. Its totient is φ = 1218256.

The previous prime is 1218251. The next prime is 1218263. The reversal of 1218257 is 7528121.

It is a balanced prime because it is at equal distance from previous prime (1218251) and next prime (1218263).

It can be written as a sum of positive squares in only one way, i.e., 863041 + 355216 = 929^2 + 596^2 .

It is an emirp because it is prime and its reverse (7528121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218257 - 2¹⁰ = 1217233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609128 + 609129.

It is an arithmetic number, because the mean of its divisors is an integer number (609129).

2^1218257 is an apocalyptic number.

It is an amenable number.

1218257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218257 is an equidigital number, since it uses as much as digits as its factorization.

1218257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

The square root of 1218257 is about 1103.7468006749. The cubic root of 1218257 is about 106.8020622232.

The spelling of 1218257 in words is "one million, two hundred eighteen thousand, two hundred fifty-seven".