131138725 has 24 divisors (see below), whose sum is σ = 169085160. Its totient is φ = 100773120.

The previous prime is 131138723. The next prime is 131138743. The reversal of 131138725 is 527831131.

It can be written as a sum of positive squares in 12 ways, for example, as 72982849 + 58155876 = 8543^2 + 7626^2 .

It is not a de Polignac number, because 131138725 - 2¹ = 131138723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131138723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200499 + ... + 201151.

It is an arithmetic number, because the mean of its divisors is an integer number (7045215).

Almost surely, 2^131138725 is an apocalyptic number.

It is an amenable number.

131138725 is a deficient number, since it is larger than the sum of its proper divisors (37946435).

131138725 is a wasteful number, since it uses less digits than its factorization.

131138725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 964 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 131138725 is about 11451.5817684720. The cubic root of 131138725 is about 508.0545193827.

Adding to 131138725 its reverse (527831131), we get a palindrome (658969856).

The spelling of 131138725 in words is "one hundred thirty-one million, one hundred thirty-eight thousand, seven hundred twenty-five".