218291949 has 16 divisors (see below), whose sum is σ = 324936640. Its totient is φ = 144834480.

The previous prime is 218291933. The next prime is 218291993. The reversal of 218291949 is 949192812.

It is not a de Polignac number, because 218291949 - 2⁴ = 218291933 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 (218290949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13462 + ... + 24855.

It is an arithmetic number, because the mean of its divisors is an integer number (20308540).

Almost surely, 2^218291949 is an apocalyptic number.

It is an amenable number.

218291949 is a deficient number, since it is larger than the sum of its proper divisors (106644691).

218291949 is a wasteful number, since it uses less digits than its factorization.

218291949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38537 (or 38531 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 218291949 is about 14774.7063930218. The cubic root of 218291949 is about 602.1147128925.

The spelling of 218291949 in words is "two hundred eighteen million, two hundred ninety-one thousand, nine hundred forty-nine".