131066909 has 4 divisors (see below), whose sum is σ = 131090940. Its totient is φ = 131042880.

The previous prime is 131066893. The next prime is 131066911. The reversal of 131066909 is 909660131.

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 117722500 + 13344409 = 10850^2 + 3653^2 .

It is a cyclic number.

It is not a de Polignac number, because 131066909 - 2⁴ = 131066893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131066939) 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, 539 + ... + 16199.

It is an arithmetic number, because the mean of its divisors is an integer number (32772735).

Almost surely, 2^131066909 is an apocalyptic number.

It is an amenable number.

131066909 is a deficient number, since it is larger than the sum of its proper divisors (24031).

131066909 is an equidigital number, since it uses as much as digits as its factorization.

131066909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24030.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 131066909 is about 11448.4457023650. The cubic root of 131066909 is about 507.9617598367.

The spelling of 131066909 in words is "one hundred thirty-one million, sixty-six thousand, nine hundred nine".