143521 has 12 divisors (see below), whose sum is σ = 174420. Its totient is φ = 117600.

The previous prime is 143519. The next prime is 143527. The reversal of 143521 is 125341.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 30625 = 336^2 + 175^2 .

It is not a de Polignac number, because 143521 - 2¹ = 143519 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 143495 and 143504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1371 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (14535).

2¹⁴³⁵²¹ is an apocalyptic number.

It is an amenable number.

143521 is a deficient number, since it is larger than the sum of its proper divisors (30899).

143521 is a wasteful number, since it uses less digits than its factorization.

143521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 137 counting only the distinct ones).

The product of its digits is 120, while the sum is 16.

The square root of 143521 is about 378.8416555766. The cubic root of 143521 is about 52.3566459575.

Adding to 143521 its product of digits (120), we get a square (143641 = 379²).

Adding to 143521 its reverse (125341), we get a palindrome (268862).

It can be divided in two parts, 1435 and 21, that multiplied together give a triangular number (30135 = T₂₄₅).

The spelling of 143521 in words is "one hundred forty-three thousand, five hundred twenty-one".