218633149 has 6 divisors (see below), whose sum is σ = 254328414. Its totient is φ = 187399800.

The previous prime is 218633119. The next prime is 218633153. The reversal of 218633149 is 941336812.

It can be written as a sum of positive squares in only one way, i.e., 218152900 + 480249 = 14770^2 + 693^2 .

It is not a de Polignac number, because 218633149 - 2⁹ = 218632637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218633119) 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, 2230902 + ... + 2230999.

It is an arithmetic number, because the mean of its divisors is an integer number (42388069).

Almost surely, 2^218633149 is an apocalyptic number.

It is an amenable number.

218633149 is a deficient number, since it is larger than the sum of its proper divisors (35695265).

218633149 is an equidigital number, since it uses as much as digits as its factorization.

218633149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461915 (or 4461908 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 218633149 is about 14786.2486452785. The cubic root of 218633149 is about 602.4282602553.

The spelling of 218633149 in words is "two hundred eighteen million, six hundred thirty-three thousand, one hundred forty-nine".