1000521 has 12 divisors (see below), whose sum is σ = 1521520. Its totient is φ = 631800.

The previous prime is 1000507. The next prime is 1000537. The reversal of 1000521 is 1250001.

It is a happy number.

It is not a de Polignac number, because 1000521 - 2⁶ = 1000457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1000541) 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, 2755 + ... + 3096.

2^1000521 is an apocalyptic number.

It is an amenable number.

1000521 is a deficient number, since it is larger than the sum of its proper divisors (520999).

1000521 is a wasteful number, since it uses less digits than its factorization.

1000521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876 (or 5873 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1000521 is about 1000.2604660787. The cubic root of 1000521 is about 100.0173636515.

Adding to 1000521 its reverse (1250001), we get a palindrome (2250522).

It can be divided in two parts, 1000 and 521, that added together give a square (1521 = 39²).

The spelling of 1000521 in words is "one million, five hundred twenty-one", and thus it is an aban number.