131589765 has 40 divisors (see below), whose sum is σ = 239928480. Its totient is φ = 68979168.

The previous prime is 131589719. The next prime is 131589781. The reversal of 131589765 is 567985131.

It is a happy number.

131589765 is a `hidden beast` number, since 1 + 3 + 1 + 589 + 7 + 65 = 666.

It is not a de Polignac number, because 131589765 - 2⁶ = 131589701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131589765.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 21142 + ... + 26648.

It is an arithmetic number, because the mean of its divisors is an integer number (5998212).

Almost surely, 2^131589765 is an apocalyptic number.

131589765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131589765 is a deficient number, since it is larger than the sum of its proper divisors (108338715).

131589765 is an equidigital number, since it uses as much as digits as its factorization.

131589765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583 (or 5574 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 131589765 is about 11471.2582134655. The cubic root of 131589765 is about 508.6363223405.

The spelling of 131589765 in words is "one hundred thirty-one million, five hundred eighty-nine thousand, seven hundred sixty-five".