131559809 has 4 divisors (see below), whose sum is σ = 132294960. Its totient is φ = 130824660.

The previous prime is 131559773. The next prime is 131559823. The reversal of 131559809 is 908955131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131559809 - 2¹² = 131555713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131559829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367307 + ... + 367664.

It is an arithmetic number, because the mean of its divisors is an integer number (33073740).

Almost surely, 2^131559809 is an apocalyptic number.

It is an amenable number.

131559809 is a deficient number, since it is larger than the sum of its proper divisors (735151).

131559809 is an equidigital number, since it uses as much as digits as its factorization.

131559809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735150.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 131559809 is about 11469.9524410522. The cubic root of 131559809 is about 508.5977229200.

The spelling of 131559809 in words is "one hundred thirty-one million, five hundred fifty-nine thousand, eight hundred nine".