131681618 has 8 divisors (see below), whose sum is σ = 197573040. Its totient is φ = 65823940.

The previous prime is 131681617. The next prime is 131681621. The reversal of 131681618 is 816186131.

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 (131681617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6893 + ... + 17631.

It is an arithmetic number, because the mean of its divisors is an integer number (24696630).

Almost surely, 2^131681618 is an apocalyptic number.

131681618 is a deficient number, since it is larger than the sum of its proper divisors (65891422).

131681618 is a wasteful number, since it uses less digits than its factorization.

131681618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16872.

The product of its digits is 6912, while the sum is 35.

The square root of 131681618 is about 11475.2611299264. The cubic root of 131681618 is about 508.7546418410.

The spelling of 131681618 in words is "one hundred thirty-one million, six hundred eighty-one thousand, six hundred eighteen".