218950447 has 2 divisors, whose sum is σ = 218950448. Its totient is φ = 218950446.

The previous prime is 218950441. The next prime is 218950469. The reversal of 218950447 is 744059812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218950447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218950441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109475223 + 109475224.

It is an arithmetic number, because the mean of its divisors is an integer number (109475224).

Almost surely, 2^218950447 is an apocalyptic number.

218950447 is a deficient number, since it is larger than the sum of its proper divisors (1).

218950447 is an equidigital number, since it uses as much as digits as its factorization.

218950447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 218950447 is about 14796.9742515151. The cubic root of 218950447 is about 602.7195501582.

The spelling of 218950447 in words is "two hundred eighteen million, nine hundred fifty thousand, four hundred forty-seven".