131528 has 16 divisors (see below), whose sum is σ = 253260. Its totient is φ = 64000.

The previous prime is 131519. The next prime is 131543. The reversal of 131528 is 825131.

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 484 = 362^2 + 22^2 .

It is a super-2 number, since 2×131528² = 34599229568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128 + ... + 528.

2¹³¹⁵²⁸ is an apocalyptic number.

It is an amenable number.

131528 is a deficient number, since it is larger than the sum of its proper divisors (121732).

131528 is a wasteful number, since it uses less digits than its factorization.

131528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 444 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 131528 is about 362.6678921548. The cubic root of 131528 is about 50.8556729425.

Adding to 131528 its reverse (825131), we get a palindrome (956659).

The spelling of 131528 in words is "one hundred thirty-one thousand, five hundred twenty-eight".