131709131 has 4 divisors (see below), whose sum is σ = 133296072. Its totient is φ = 130122192.

The previous prime is 131709119. The next prime is 131709133. The reversal of 131709131 is 131907131.

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

It is a cyclic number.

It is not a de Polignac number, because 131709131 - 2¹⁰ = 131708107 is a prime.

It is a super-2 number, since 2×131709131² = 34694590377550322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131709131.

It is not an unprimeable number, because it can be changed into a prime (131709133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793346 + ... + 793511.

It is an arithmetic number, because the mean of its divisors is an integer number (33324018).

Almost surely, 2^131709131 is an apocalyptic number.

131709131 is a deficient number, since it is larger than the sum of its proper divisors (1586941).

131709131 is an equidigital number, since it uses as much as digits as its factorization.

131709131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586940.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 131709131 is about 11476.4598635642. The cubic root of 131709131 is about 508.7900717209.

The spelling of 131709131 in words is "one hundred thirty-one million, seven hundred nine thousand, one hundred thirty-one".