131663218 has 16 divisors (see below), whose sum is σ = 204596280. Its totient is φ = 63500800.

The previous prime is 131663167. The next prime is 131663221. The reversal of 131663218 is 812366131.

It can be written as a sum of positive squares in 4 ways, for example, as 23648769 + 108014449 = 4863^2 + 10393^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131663218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1723 + ... + 16318.

Almost surely, 2^131663218 is an apocalyptic number.

131663218 is a deficient number, since it is larger than the sum of its proper divisors (72933062).

131663218 is a wasteful number, since it uses less digits than its factorization.

131663218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18173.

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

The square root of 131663218 is about 11474.4593772430. The cubic root of 131663218 is about 508.7309444776.

It can be divided in two parts, 13166 and 3218, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 131663218 in words is "one hundred thirty-one million, six hundred sixty-three thousand, two hundred eighteen".