142581 has 4 divisors (see below), whose sum is σ = 190112. Its totient is φ = 95052.

The previous prime is 142573. The next prime is 142589. The reversal of 142581 is 185241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (142573) and next prime (142589).

It is not a de Polignac number, because 142581 - 2³ = 142573 is a prime.

It is a super-2 number, since 2×142581² = 40658683122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142581.

It is not an unprimeable number, because it can be changed into a prime (142589) 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, 23761 + ... + 23766.

It is an arithmetic number, because the mean of its divisors is an integer number (47528).

2¹⁴²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

142581 is a deficient number, since it is larger than the sum of its proper divisors (47531).

142581 is an equidigital number, since it uses as much as digits as its factorization.

142581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47530.

The product of its digits is 320, while the sum is 21.

The square root of 142581 is about 377.5989936427. The cubic root of 142581 is about 52.2420910932.

The spelling of 142581 in words is "one hundred forty-two thousand, five hundred eighty-one".