218946061 has 2 divisors, whose sum is σ = 218946062. Its totient is φ = 218946060.

The previous prime is 218946059. The next prime is 218946073. The reversal of 218946061 is 160649812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146168100 + 72777961 = 12090^2 + 8531^2 .

It is a cyclic number.

It is not a de Polignac number, because 218946061 - 2¹ = 218946059 is a prime.

Together with 218946059, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 218946061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218946461) 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 as a sum of consecutive naturals, namely, 109473030 + 109473031.

It is an arithmetic number, because the mean of its divisors is an integer number (109473031).

Almost surely, 2^218946061 is an apocalyptic number.

It is an amenable number.

218946061 is a deficient number, since it is larger than the sum of its proper divisors (1).

218946061 is an equidigital number, since it uses as much as digits as its factorization.

218946061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 218946061 is about 14796.8260447976. The cubic root of 218946061 is about 602.7155255860.

The spelling of 218946061 in words is "two hundred eighteen million, nine hundred forty-six thousand, sixty-one".