1142521 has 4 divisors (see below), whose sum is σ = 1164132. Its totient is φ = 1120912.

The previous prime is 1142509. The next prime is 1142539. The reversal of 1142521 is 1252411.

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 436921 + 705600 = 661^2 + 840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1142495 and 1142504.

It is not an unprimeable number, because it can be changed into a prime (1142021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10726 + ... + 10831.

It is an arithmetic number, because the mean of its divisors is an integer number (291033).

2^1142521 is an apocalyptic number.

It is an amenable number.

1142521 is a deficient number, since it is larger than the sum of its proper divisors (21611).

1142521 is an equidigital number, since it uses as much as digits as its factorization.

1142521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21610.

The product of its digits is 80, while the sum is 16.

The square root of 1142521 is about 1068.8877396621. The cubic root of 1142521 is about 104.5413402975.

Adding to 1142521 its reverse (1252411), we get a palindrome (2394932).

The spelling of 1142521 in words is "one million, one hundred forty-two thousand, five hundred twenty-one".