7131218 has 8 divisors (see below), whose sum is σ = 10735740. Its totient is φ = 3552640.

The previous prime is 7131217. The next prime is 7131259. The reversal of 7131218 is 8121317.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7006609 + 124609 = 2647^2 + 353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 7131193 and 7131202.

It is not an unprimeable number, because it can be changed into a prime (7131217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5783 + ... + 6906.

Almost surely, 2^7131218 is an apocalyptic number.

7131218 is a deficient number, since it is larger than the sum of its proper divisors (3604522).

7131218 is a wasteful number, since it uses less digits than its factorization.

7131218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12972.

The product of its digits is 336, while the sum is 23.

The square root of 7131218 is about 2670.4340471167. The cubic root of 7131218 is about 192.4810168496.

Subtracting 7131218 from its reverse (8121317), we obtain a palindrome (990099).

The spelling of 7131218 in words is "seven million, one hundred thirty-one thousand, two hundred eighteen".