218313137 has 12 divisors (see below), whose sum is σ = 251012736. Its totient is φ = 185997360.

The previous prime is 218313119. The next prime is 218313181. The reversal of 218313137 is 731313812.

It is not a de Polignac number, because 218313137 - 2¹² = 218309041 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 (218313197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 506312 + ... + 506742.

It is an arithmetic number, because the mean of its divisors is an integer number (20917728).

Almost surely, 2^218313137 is an apocalyptic number.

It is an amenable number.

218313137 is a deficient number, since it is larger than the sum of its proper divisors (32699599).

218313137 is an frugal number, since it uses more digits than its factorization.

218313137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 707 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 218313137 is about 14775.4234118688. The cubic root of 218313137 is about 602.1341932167.

Adding to 218313137 its reverse (731313812), we get a palindrome (949626949).

The spelling of 218313137 in words is "two hundred eighteen million, three hundred thirteen thousand, one hundred thirty-seven".