131439725 has 12 divisors (see below), whose sum is σ = 167391444. Its totient is φ = 102309120.

The previous prime is 131439709. The next prime is 131439731. The reversal of 131439725 is 527934131.

It can be written as a sum of positive squares in 6 ways, for example, as 131044 + 131308681 = 362^2 + 11459^2 .

It is not a de Polignac number, because 131439725 - 2⁴ = 131439709 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 70124 + ... + 71973.

It is an arithmetic number, because the mean of its divisors is an integer number (13949287).

Almost surely, 2^131439725 is an apocalyptic number.

It is an amenable number.

131439725 is a deficient number, since it is larger than the sum of its proper divisors (35951719).

131439725 is a wasteful number, since it uses less digits than its factorization.

131439725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142144 (or 142139 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 131439725 is about 11464.7165250607. The cubic root of 131439725 is about 508.4429313688.

The spelling of 131439725 in words is "one hundred thirty-one million, four hundred thirty-nine thousand, seven hundred twenty-five".