131709724 has 12 divisors (see below), whose sum is σ = 232646904. Its totient is φ = 65239184.

The previous prime is 131709719. The next prime is 131709737. The reversal of 131709724 is 427907131.

It is a self number, because there is not a number n which added to its sum of digits gives 131709724.

It is a congruent number.

It is an unprimeable number.

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, 153439 + ... + 154294.

It is an arithmetic number, because the mean of its divisors is an integer number (19387242).

Almost surely, 2^131709724 is an apocalyptic number.

It is an amenable number.

131709724 is a deficient number, since it is larger than the sum of its proper divisors (100937180).

131709724 is a wasteful number, since it uses less digits than its factorization.

131709724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307844 (or 307842 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 131709724 is about 11476.4856990283. The cubic root of 131709724 is about 508.7908353026.

The spelling of 131709724 in words is "one hundred thirty-one million, seven hundred nine thousand, seven hundred twenty-four".