218315969 has 2 divisors, whose sum is σ = 218315970. Its totient is φ = 218315968.

The previous prime is 218315963. The next prime is 218316001. The reversal of 218315969 is 969513812.

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., 215003569 + 3312400 = 14663^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 218315969 - 2⁴ = 218315953 is a prime.

It is a super-2 number, since 2×218315969² = 95323724640817922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218315963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109157984 + 109157985.

It is an arithmetic number, because the mean of its divisors is an integer number (109157985).

Almost surely, 2^218315969 is an apocalyptic number.

It is an amenable number.

218315969 is a deficient number, since it is larger than the sum of its proper divisors (1).

218315969 is an equidigital number, since it uses as much as digits as its factorization.

218315969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 218315969 is about 14775.5192463751. The cubic root of 218315969 is about 602.1367968722.

The spelling of 218315969 in words is "two hundred eighteen million, three hundred fifteen thousand, nine hundred sixty-nine".