1020561 has 8 divisors (see below), whose sum is σ = 1440864. Its totient is φ = 640320.

The previous prime is 1020557. The next prime is 1020583. The reversal of 1020561 is 1650201.

1020561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020561 - 2² = 1020557 is a prime.

It is a Smith number, since the sum of its digits (15) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

1020561 is a modest number, since divided by 561 gives 102 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1020561.

It is not an unprimeable number, because it can be changed into a prime (1020541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9955 + ... + 10056.

It is an arithmetic number, because the mean of its divisors is an integer number (180108).

2^1020561 is an apocalyptic number.

It is an amenable number.

1020561 is a deficient number, since it is larger than the sum of its proper divisors (420303).

1020561 is a wasteful number, since it uses less digits than its factorization.

1020561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20031.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1020561 is about 1010.2281920438. The cubic root of 1020561 is about 100.6807223233.

Adding to 1020561 its reverse (1650201), we get a palindrome (2670762).

The spelling of 1020561 in words is "one million, twenty thousand, five hundred sixty-one".