131689918 has 16 divisors (see below), whose sum is σ = 200249280. Its totient is φ = 64944000.

The previous prime is 131689897. The next prime is 131689963. The reversal of 131689918 is 819986131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106363 + ... + 107593.

It is an arithmetic number, because the mean of its divisors is an integer number (12515580).

Almost surely, 2^131689918 is an apocalyptic number.

131689918 is a deficient number, since it is larger than the sum of its proper divisors (68559362).

131689918 is a wasteful number, since it uses less digits than its factorization.

131689918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

The product of its digits is 93312, while the sum is 46.

The square root of 131689918 is about 11475.6227717715. The cubic root of 131689918 is about 508.7653306900.

The spelling of 131689918 in words is "one hundred thirty-one million, six hundred eighty-nine thousand, nine hundred eighteen".