131887609 has 16 divisors (see below), whose sum is σ = 156303360. Its totient is φ = 108899280.

The previous prime is 131887603. The next prime is 131887619. The reversal of 131887609 is 906788131.

It is not a de Polignac number, because 131887609 - 2¹³ = 131879417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131887603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50592 + ... + 53134.

It is an arithmetic number, because the mean of its divisors is an integer number (9768960).

Almost surely, 2^131887609 is an apocalyptic number.

It is an amenable number.

131887609 is a deficient number, since it is larger than the sum of its proper divisors (24415751).

131887609 is a wasteful number, since it uses less digits than its factorization.

131887609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 131887609 is about 11484.2330610276. The cubic root of 131887609 is about 509.0197871221.

It can be divided in two parts, 131887 and 609, that added together give a square (132496 = 364²).

The spelling of 131887609 in words is "one hundred thirty-one million, eight hundred eighty-seven thousand, six hundred nine".