132581 has 4 divisors (see below), whose sum is σ = 133452. Its totient is φ = 131712.

The previous prime is 132547. The next prime is 132589. The reversal of 132581 is 185231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 185231 = 19 ⋅9749.

It can be written as a sum of positive squares in 2 ways, for example, as 96100 + 36481 = 310^2 + 191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-132581 is a prime.

It is a super-2 number, since 2×132581² = 35155443122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (132589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140 + ... + 533.

It is an arithmetic number, because the mean of its divisors is an integer number (33363).

2¹³²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

132581 is a deficient number, since it is larger than the sum of its proper divisors (871).

132581 is an equidigital number, since it uses as much as digits as its factorization.

132581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

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

The square root of 132581 is about 364.1167395218. The cubic root of 132581 is about 50.9910275129.

Subtracting 132581 from its reverse (185231), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 132581 in words is "one hundred thirty-two thousand, five hundred eighty-one".