1218313 has 2 divisors, whose sum is σ = 1218314. Its totient is φ = 1218312.

The previous prime is 1218307. The next prime is 1218367. The reversal of 1218313 is 3138121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944784 + 273529 = 972^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218313 - 2⁵ = 1218281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609156 + 609157.

It is an arithmetic number, because the mean of its divisors is an integer number (609157).

2^1218313 is an apocalyptic number.

It is an amenable number.

1218313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218313 is an equidigital number, since it uses as much as digits as its factorization.

1218313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1218313 is about 1103.7721685203. The cubic root of 1218313 is about 106.8036986660.

The spelling of 1218313 in words is "one million, two hundred eighteen thousand, three hundred thirteen".