218012051 has 4 divisors (see below), whose sum is σ = 218054352. Its totient is φ = 217969752.

The previous prime is 218012017. The next prime is 218012077. The reversal of 218012051 is 150210812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218012051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218012551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12140 + ... + 24153.

It is an arithmetic number, because the mean of its divisors is an integer number (54513588).

Almost surely, 2^218012051 is an apocalyptic number.

218012051 is a deficient number, since it is larger than the sum of its proper divisors (42301).

218012051 is an equidigital number, since it uses as much as digits as its factorization.

218012051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42300.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 218012051 is about 14765.2311529485. The cubic root of 218012051 is about 601.8572552582.

Adding to 218012051 its reverse (150210812), we get a palindrome (368222863).

The spelling of 218012051 in words is "two hundred eighteen million, twelve thousand, fifty-one".