131618 has 4 divisors (see below), whose sum is σ = 197430. Its totient is φ = 65808.

The previous prime is 131617. The next prime is 131627. The reversal of 131618 is 816131.

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., 80089 + 51529 = 283^2 + 227^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131618.

It is not an unprimeable number, because it can be changed into a prime (131611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32903 + ... + 32906.

2¹³¹⁶¹⁸ is an apocalyptic number.

131618 is a deficient number, since it is larger than the sum of its proper divisors (65812).

131618 is an equidigital number, since it uses as much as digits as its factorization.

131618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65811.

The product of its digits is 144, while the sum is 20.

The square root of 131618 is about 362.7919513991. The cubic root of 131618 is about 50.8672698826.

Adding to 131618 its reverse (816131), we get a palindrome (947749).

The spelling of 131618 in words is "one hundred thirty-one thousand, six hundred eighteen".