131087785 has 4 divisors (see below), whose sum is σ = 157305348. Its totient is φ = 104870224.

The previous prime is 131087777. The next prime is 131087807. The reversal of 131087785 is 587780131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54997056 + 76090729 = 7416^2 + 8723^2 .

It is a cyclic number.

It is not a de Polignac number, because 131087785 - 2³ = 131087777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13108774 + ... + 13108783.

It is an arithmetic number, because the mean of its divisors is an integer number (39326337).

Almost surely, 2^131087785 is an apocalyptic number.

It is an amenable number.

131087785 is a deficient number, since it is larger than the sum of its proper divisors (26217563).

131087785 is an equidigital number, since it uses as much as digits as its factorization.

131087785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26217562.

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 131087785 is about 11449.3574055490. The cubic root of 131087785 is about 507.9887273523.

The spelling of 131087785 in words is "one hundred thirty-one million, eighty-seven thousand, seven hundred eighty-five".