131078009 has 4 divisors (see below), whose sum is σ = 131190180. Its totient is φ = 130965840.

The previous prime is 131077987. The next prime is 131078011. The reversal of 131078009 is 900870131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127057984 + 4020025 = 11272^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 131078009 - 2²⁴ = 114300793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131078089) 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, 54314 + ... + 56675.

It is an arithmetic number, because the mean of its divisors is an integer number (32797545).

Almost surely, 2^131078009 is an apocalyptic number.

It is an amenable number.

131078009 is a deficient number, since it is larger than the sum of its proper divisors (112171).

131078009 is a wasteful number, since it uses less digits than its factorization.

131078009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112170.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 131078009 is about 11448.9304740661. The cubic root of 131078009 is about 507.9760991194.

The spelling of 131078009 in words is "one hundred thirty-one million, seventy-eight thousand, nine".