218950913 has 2 divisors, whose sum is σ = 218950914. Its totient is φ = 218950912.

The previous prime is 218950903. The next prime is 218950933. The reversal of 218950913 is 319059812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217621504 + 1329409 = 14752^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 218950913 - 2⁸ = 218950657 is a prime.

It is not a weakly prime, because it can be changed into another prime (218950903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109475456 + 109475457.

It is an arithmetic number, because the mean of its divisors is an integer number (109475457).

Almost surely, 2^218950913 is an apocalyptic number.

It is an amenable number.

218950913 is a deficient number, since it is larger than the sum of its proper divisors (1).

218950913 is an equidigital number, since it uses as much as digits as its factorization.

218950913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 218950913 is about 14796.9899979692. The cubic root of 218950913 is about 602.7199777543.

The spelling of 218950913 in words is "two hundred eighteen million, nine hundred fifty thousand, nine hundred thirteen".