218159999 has 2 divisors, whose sum is σ = 218160000. Its totient is φ = 218159998.

The previous prime is 218159959. The next prime is 218160013. The reversal of 218159999 is 999951812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218159999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218159999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218159959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109079999 + 109080000.

It is an arithmetic number, because the mean of its divisors is an integer number (109080000).

Almost surely, 2^218159999 is an apocalyptic number.

218159999 is a deficient number, since it is larger than the sum of its proper divisors (1).

218159999 is an equidigital number, since it uses as much as digits as its factorization.

218159999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 53.

The square root of 218159999 is about 14770.2403162576. The cubic root of 218159999 is about 601.9933692054.

The spelling of 218159999 in words is "two hundred eighteen million, one hundred fifty-nine thousand, nine hundred ninety-nine".