131285578 has 4 divisors (see below), whose sum is σ = 196928370. Its totient is φ = 65642788.

The previous prime is 131285563. The next prime is 131285641. The reversal of 131285578 is 875582131.

131285578 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875582131 = 313 ⋅2797387.

It can be written as a sum of positive squares in only one way, i.e., 129345129 + 1940449 = 11373^2 + 1393^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131285578.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32821393 + ... + 32821396.

Almost surely, 2^131285578 is an apocalyptic number.

131285578 is a deficient number, since it is larger than the sum of its proper divisors (65642792).

131285578 is an equidigital number, since it uses as much as digits as its factorization.

131285578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65642791.

The product of its digits is 67200, while the sum is 40.

The square root of 131285578 is about 11457.9918833974. The cubic root of 131285578 is about 508.2440934330.

The spelling of 131285578 in words is "one hundred thirty-one million, two hundred eighty-five thousand, five hundred seventy-eight".