131611855 has 16 divisors (see below), whose sum is σ = 161441280. Its totient is φ = 102977568.

The previous prime is 131611853. The next prime is 131611861. The reversal of 131611855 is 558116131.

It is a cyclic number.

It is not a de Polignac number, because 131611855 - 2¹ = 131611853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131611853) 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 15 ways as a sum of consecutive naturals, for example, 41206 + ... + 44284.

It is an arithmetic number, because the mean of its divisors is an integer number (10090080).

Almost surely, 2^131611855 is an apocalyptic number.

131611855 is a deficient number, since it is larger than the sum of its proper divisors (29829425).

131611855 is a wasteful number, since it uses less digits than its factorization.

131611855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its digits is 3600, while the sum is 31.

The square root of 131611855 is about 11472.2210142587. The cubic root of 131611855 is about 508.6647823748.

Adding to 131611855 its reverse (558116131), we get a palindrome (689727986).

The spelling of 131611855 in words is "one hundred thirty-one million, six hundred eleven thousand, eight hundred fifty-five".