131135618 has 4 divisors (see below), whose sum is σ = 196703430. Its totient is φ = 65567808.

The previous prime is 131135591. The next prime is 131135623. The reversal of 131135618 is 816531131.

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., 66863329 + 64272289 = 8177^2 + 8017^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32783903 + ... + 32783906.

Almost surely, 2^131135618 is an apocalyptic number.

131135618 is a deficient number, since it is larger than the sum of its proper divisors (65567812).

131135618 is an equidigital number, since it uses as much as digits as its factorization.

131135618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65567811.

The product of its digits is 2160, while the sum is 29.

The square root of 131135618 is about 11451.4461095532. The cubic root of 131135618 is about 508.0505069960.

Adding to 131135618 its reverse (816531131), we get a palindrome (947666749).

The spelling of 131135618 in words is "one hundred thirty-one million, one hundred thirty-five thousand, six hundred eighteen".