218115051 has 32 divisors (see below), whose sum is σ = 364497408. Its totient is φ = 112707840.

The previous prime is 218115019. The next prime is 218115089. The reversal of 218115051 is 150511812.

It is not a de Polignac number, because 218115051 - 2⁵ = 218115019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218115011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43111 + ... + 47903.

It is an arithmetic number, because the mean of its divisors is an integer number (11390544).

Almost surely, 2^218115051 is an apocalyptic number.

218115051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

218115051 is a deficient number, since it is larger than the sum of its proper divisors (146382357).

218115051 is a wasteful number, since it uses less digits than its factorization.

218115051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011.

The product of its (nonzero) digits is 400, while the sum is 24.

The square root of 218115051 is about 14768.7186647996. The cubic root of 218115051 is about 601.9520230121.

Adding to 218115051 its reverse (150511812), we get a palindrome (368626863).

It can be divided in two parts, 21811 and 5051, that added together give a palindrome (26862).

The spelling of 218115051 in words is "two hundred eighteen million, one hundred fifteen thousand, fifty-one".