218049493 has 4 divisors (see below), whose sum is σ = 218149120. Its totient is φ = 217949868.

The previous prime is 218049487. The next prime is 218049523. The reversal of 218049493 is 394940812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218049493 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 (218043493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46455 + ... + 50932.

It is an arithmetic number, because the mean of its divisors is an integer number (54537280).

Almost surely, 2^218049493 is an apocalyptic number.

It is an amenable number.

218049493 is a deficient number, since it is larger than the sum of its proper divisors (99627).

218049493 is an equidigital number, since it uses as much as digits as its factorization.

218049493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99626.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 218049493 is about 14766.4990095825. The cubic root of 218049493 is about 601.8917081692.

The spelling of 218049493 in words is "two hundred eighteen million, forty-nine thousand, four hundred ninety-three".