218985057 has 6 divisors (see below), whose sum is σ = 316311762. Its totient is φ = 145990032.

The previous prime is 218985031. The next prime is 218985071. The reversal of 218985057 is 750589812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 147768336 + 71216721 = 12156^2 + 8439^2 .

It is not a de Polignac number, because 218985057 - 2⁶ = 218984993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218985017) 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 5 ways as a sum of consecutive naturals, for example, 12165828 + ... + 12165845.

It is an arithmetic number, because the mean of its divisors is an integer number (52718627).

Almost surely, 2^218985057 is an apocalyptic number.

It is an amenable number.

218985057 is a deficient number, since it is larger than the sum of its proper divisors (97326705).

218985057 is a wasteful number, since it uses less digits than its factorization.

218985057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24331679 (or 24331676 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 218985057 is about 14798.1437011539. The cubic root of 218985057 is about 602.7513062395.

The spelling of 218985057 in words is "two hundred eighteen million, nine hundred eighty-five thousand, fifty-seven".