1013521 has 4 divisors (see below), whose sum is σ = 1048500. Its totient is φ = 978544.

The previous prime is 1013503. The next prime is 1013527. The reversal of 1013521 is 1253101.

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 239121 + 774400 = 489^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013521 - 2⁹ = 1013009 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1013527) 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, 17446 + ... + 17503.

It is an arithmetic number, because the mean of its divisors is an integer number (262125).

2^1013521 is an apocalyptic number.

It is an amenable number.

1013521 is a deficient number, since it is larger than the sum of its proper divisors (34979).

1013521 is an equidigital number, since it uses as much as digits as its factorization.

1013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34978.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1013521 is about 1006.7378010187. The cubic root of 1013521 is about 100.4486838174.

Adding to 1013521 its reverse (1253101), we get a palindrome (2266622).

It can be divided in two parts, 10 and 13521, that added together give a palindrome (13531).

The spelling of 1013521 in words is "one million, thirteen thousand, five hundred twenty-one".