1022521 has 4 divisors (see below), whose sum is σ = 1034100. Its totient is φ = 1010944.

The previous prime is 1022519. The next prime is 1022531. The reversal of 1022521 is 1252201.

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 212521 + 810000 = 461^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022521 - 2¹ = 1022519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1022501) 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, 5656 + ... + 5833.

It is an arithmetic number, because the mean of its divisors is an integer number (258525).

2^1022521 is an apocalyptic number.

It is an amenable number.

1022521 is a deficient number, since it is larger than the sum of its proper divisors (11579).

1022521 is an equidigital number, since it uses as much as digits as its factorization.

1022521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1022521 is about 1011.1978045862. The cubic root of 1022521 is about 100.7451339632.

Adding to 1022521 its reverse (1252201), we get a palindrome (2274722).

The spelling of 1022521 in words is "one million, twenty-two thousand, five hundred twenty-one".