218611071 has 12 divisors (see below), whose sum is σ = 360881872. Its totient is φ = 124920576.

The previous prime is 218611051. The next prime is 218611073. The reversal of 218611071 is 170116812.

It is not a de Polignac number, because 218611071 - 2¹¹ = 218609023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218611073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1734946 + ... + 1735071.

Almost surely, 2^218611071 is an apocalyptic number.

218611071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

218611071 is a deficient number, since it is larger than the sum of its proper divisors (142270801).

218611071 is a wasteful number, since it uses less digits than its factorization.

218611071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470030 (or 3470027 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 218611071 is about 14785.5020543775. The cubic root of 218611071 is about 602.4079814475.

Adding to 218611071 its reverse (170116812), we get a palindrome (388727883).

The spelling of 218611071 in words is "two hundred eighteen million, six hundred eleven thousand, seventy-one".