131636845 has 24 divisors (see below), whose sum is σ = 167966136. Its totient is φ = 99021312.

The previous prime is 131636837. The next prime is 131636849. The reversal of 131636845 is 548636131.

It can be written as a sum of positive squares in 4 ways, for example, as 4691556 + 126945289 = 2166^2 + 11267^2 .

It is not a de Polignac number, because 131636845 - 2³ = 131636837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131636849) 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 23 ways as a sum of consecutive naturals, for example, 420409 + ... + 420721.

It is an arithmetic number, because the mean of its divisors is an integer number (6998589).

Almost surely, 2^131636845 is an apocalyptic number.

It is an amenable number.

131636845 is a deficient number, since it is larger than the sum of its proper divisors (36329291).

131636845 is a wasteful number, since it uses less digits than its factorization.

131636845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589 (or 570 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 131636845 is about 11473.3101152196. The cubic root of 131636845 is about 508.6969748357.

The spelling of 131636845 in words is "one hundred thirty-one million, six hundred thirty-six thousand, eight hundred forty-five".