131442009 has 4 divisors (see below), whose sum is σ = 175256016. Its totient is φ = 87628004.

The previous prime is 131441983. The next prime is 131442041. The reversal of 131442009 is 900244131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 900244131 = 3 ⋅300081377.

It is a cyclic number.

It is not a de Polignac number, because 131442009 - 2⁷ = 131441881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131442009.

It is not an unprimeable number, because it can be changed into a prime (131442049) 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, 21906999 + ... + 21907004.

It is an arithmetic number, because the mean of its divisors is an integer number (43814004).

Almost surely, 2^131442009 is an apocalyptic number.

It is an amenable number.

131442009 is a deficient number, since it is larger than the sum of its proper divisors (43814007).

131442009 is an equidigital number, since it uses as much as digits as its factorization.

131442009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43814006.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 131442009 is about 11464.8161345920. The cubic root of 131442009 is about 508.4458763865.

The spelling of 131442009 in words is "one hundred thirty-one million, four hundred forty-two thousand, nine".