143581 has 4 divisors (see below), whose sum is σ = 145792. Its totient is φ = 141372.

The previous prime is 143573. The next prime is 143593. The reversal of 143581 is 185341.

143581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 143581 - 2³ = 143573 is a prime.

It is a super-2 number, since 2×143581² = 41231007122, which contains 22 as substring.

143581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143501) 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, 1005 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (36448).

2¹⁴³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

143581 is a deficient number, since it is larger than the sum of its proper divisors (2211).

143581 is an equidigital number, since it uses as much as digits as its factorization.

143581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its digits is 480, while the sum is 22.

The square root of 143581 is about 378.9208360595. The cubic root of 143581 is about 52.3639409668.

The spelling of 143581 in words is "one hundred forty-three thousand, five hundred eighty-one".