131111891618 has 8 divisors (see below), whose sum is σ = 197686842348. Its totient is φ = 65216277504.

The previous prime is 131111891611. The next prime is 131111891627. The reversal of 131111891618 is 816198111131.

It can be written as a sum of positive squares in 2 ways, for example, as 120129480409 + 10982411209 = 346597^2 + 104797^2 .

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

It is not an unprimeable number, because it can be changed into a prime (131111891611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169833671 + ... + 169834442.

Almost surely, 2^131111891618 is an apocalyptic number.

131111891618 is a deficient number, since it is larger than the sum of its proper divisors (66574950730).

131111891618 is a wasteful number, since it uses less digits than its factorization.

131111891618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339668308.

The product of its digits is 10368, while the sum is 41.

The spelling of 131111891618 in words is "one hundred thirty-one billion, one hundred eleven million, eight hundred ninety-one thousand, six hundred eighteen".