1025521 has 6 divisors (see below), whose sum is σ = 1193010. Its totient is φ = 878976.

The previous prime is 1025513. The next prime is 1025537. The reversal of 1025521 is 1255201.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 132496 = 945^2 + 364^2 .

It is not a de Polignac number, because 1025521 - 2³ = 1025513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1025495 and 1025504.

It is not an unprimeable number, because it can be changed into a prime (1025551) 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 5 ways as a sum of consecutive naturals, for example, 10416 + ... + 10513.

It is an arithmetic number, because the mean of its divisors is an integer number (198835).

2^1025521 is an apocalyptic number.

It is an amenable number.

1025521 is a deficient number, since it is larger than the sum of its proper divisors (167489).

1025521 is an equidigital number, since it uses as much as digits as its factorization.

1025521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20943 (or 20936 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1025521 is about 1012.6801074377. The cubic root of 1025521 is about 100.8435639886.

The spelling of 1025521 in words is "one million, twenty-five thousand, five hundred twenty-one".