1143521 has 4 divisors (see below), whose sum is σ = 1146132. Its totient is φ = 1140912.

The previous prime is 1143487. The next prime is 1143529. The reversal of 1143521 is 1253411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 829921 = 560^2 + 911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143521 is a prime.

It is a d-powerful number, because it can be written as 1 + 1 + 4¹⁰ + 3¹⁰ + 5⁵ + 2¹⁵ + 1 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1143521.

It is not an unprimeable number, because it can be changed into a prime (1143529) 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, 470 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (286533).

2^1143521 is an apocalyptic number.

It is an amenable number.

1143521 is a deficient number, since it is larger than the sum of its proper divisors (2611).

1143521 is an equidigital number, since it uses as much as digits as its factorization.

1143521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its digits is 120, while the sum is 17.

The square root of 1143521 is about 1069.3554133215. The cubic root of 1143521 is about 104.5718315984.

Adding to 1143521 its reverse (1253411), we get a palindrome (2396932).

It can be divided in two parts, 11 and 43521, that multiplied together give a triangular number (478731 = T₉₇₈).

The spelling of 1143521 in words is "one million, one hundred forty-three thousand, five hundred twenty-one".