131309709 has 8 divisors (see below), whose sum is σ = 181116960. Its totient is φ = 84521136.

The previous prime is 131309701. The next prime is 131309719. The reversal of 131309709 is 907903131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131309709 - 2³ = 131309701 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131309709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131309701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754567 + ... + 754740.

It is an arithmetic number, because the mean of its divisors is an integer number (22639620).

Almost surely, 2^131309709 is an apocalyptic number.

It is an amenable number.

131309709 is a deficient number, since it is larger than the sum of its proper divisors (49807251).

131309709 is a wasteful number, since it uses less digits than its factorization.

131309709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509339.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 131309709 is about 11459.0448554842. The cubic root of 131309709 is about 508.2752308640.

The spelling of 131309709 in words is "one hundred thirty-one million, three hundred nine thousand, seven hundred nine".