131366218 has 4 divisors (see below), whose sum is σ = 197049330. Its totient is φ = 65683108.

The previous prime is 131366159. The next prime is 131366231. The reversal of 131366218 is 812663131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 76265289 + 55100929 = 8733^2 + 7423^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131366218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32841553 + ... + 32841556.

Almost surely, 2^131366218 is an apocalyptic number.

131366218 is a deficient number, since it is larger than the sum of its proper divisors (65683112).

131366218 is an equidigital number, since it uses as much as digits as its factorization.

131366218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65683111.

The product of its digits is 5184, while the sum is 31.

The square root of 131366218 is about 11461.5102844259. The cubic root of 131366218 is about 508.3481323172.

The spelling of 131366218 in words is "one hundred thirty-one million, three hundred sixty-six thousand, two hundred eighteen".