218159811 has 36 divisors (see below), whose sum is σ = 335617464. Its totient is φ = 141717600.

The previous prime is 218159801. The next prime is 218159831. The reversal of 218159811 is 118951812.

It is not a de Polignac number, because 218159811 - 2¹¹ = 218157763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218159801) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 268596 + ... + 269406.

Almost surely, 2^218159811 is an apocalyptic number.

218159811 is a deficient number, since it is larger than the sum of its proper divisors (117457653).

218159811 is an frugal number, since it uses more digits than its factorization.

218159811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 855 counting only the distinct ones).

The product of its digits is 5760, while the sum is 36.

The square root of 218159811 is about 14770.2339521079. The cubic root of 218159811 is about 601.9931962822.

It can be divided in two parts, 21815 and 9811, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 218159811 in words is "two hundred eighteen million, one hundred fifty-nine thousand, eight hundred eleven".