131545509 has 16 divisors (see below), whose sum is σ = 177008832. Its totient is φ = 86894208.

The previous prime is 131545501. The next prime is 131545511. The reversal of 131545509 is 905545131.

It is not a de Polignac number, because 131545509 - 2³ = 131545501 is a prime.

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 131545509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131545501) 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, 214287 + ... + 214899.

It is an arithmetic number, because the mean of its divisors is an integer number (11063052).

Almost surely, 2^131545509 is an apocalyptic number.

It is an amenable number.

131545509 is a deficient number, since it is larger than the sum of its proper divisors (45463323).

131545509 is a wasteful number, since it uses less digits than its factorization.

131545509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 131545509 is about 11469.3290562264. The cubic root of 131545509 is about 508.5792947718.

The spelling of 131545509 in words is "one hundred thirty-one million, five hundred forty-five thousand, five hundred nine".