718278217 has 2 divisors, whose sum is σ = 718278218. Its totient is φ = 718278216.

The previous prime is 718278199. The next prime is 718278241. The reversal of 718278217 is 712872817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526289481 + 191988736 = 22941^2 + 13856^2 .

It is a cyclic number.

It is not a de Polignac number, because 718278217 - 2¹⁹ = 717753929 is a prime.

It is not a weakly prime, because it can be changed into another prime (718278287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359139108 + 359139109.

It is an arithmetic number, because the mean of its divisors is an integer number (359139109).

Almost surely, 2^718278217 is an apocalyptic number.

It is an amenable number.

718278217 is a deficient number, since it is larger than the sum of its proper divisors (1).

718278217 is an equidigital number, since it uses as much as digits as its factorization.

718278217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 43.

The square root of 718278217 is about 26800.7129942470. The cubic root of 718278217 is about 895.5659340068.

The spelling of 718278217 in words is "seven hundred eighteen million, two hundred seventy-eight thousand, two hundred seventeen".