218861051 has 2 divisors, whose sum is σ = 218861052. Its totient is φ = 218861050.

The previous prime is 218861039. The next prime is 218861087. The reversal of 218861051 is 150168812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218861051 - 2¹⁰ = 218860027 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 218860999 and 218861017.

It is not a weakly prime, because it can be changed into another prime (218861011) 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 as a sum of consecutive naturals, namely, 109430525 + 109430526.

It is an arithmetic number, because the mean of its divisors is an integer number (109430526).

Almost surely, 2^218861051 is an apocalyptic number.

218861051 is a deficient number, since it is larger than the sum of its proper divisors (1).

218861051 is an equidigital number, since it uses as much as digits as its factorization.

218861051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 218861051 is about 14793.9531904086. The cubic root of 218861051 is about 602.6375102075.

The spelling of 218861051 in words is "two hundred eighteen million, eight hundred sixty-one thousand, fifty-one".