1020653 has 4 divisors (see below), whose sum is σ = 1025340. Its totient is φ = 1015968.

The previous prime is 1020631. The next prime is 1020667. The reversal of 1020653 is 3560201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3560201 = 19 ⋅187379.

It can be written as a sum of positive squares in 2 ways, for example, as 850084 + 170569 = 922^2 + 413^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020653 - 2⁶ = 1020589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020683) 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 3 ways as a sum of consecutive naturals, for example, 2000 + ... + 2457.

It is an arithmetic number, because the mean of its divisors is an integer number (256335).

2^1020653 is an apocalyptic number.

It is an amenable number.

1020653 is a deficient number, since it is larger than the sum of its proper divisors (4687).

1020653 is an equidigital number, since it uses as much as digits as its factorization.

1020653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1020653 is about 1010.2737252844. The cubic root of 1020653 is about 100.6837475706.

Adding to 1020653 its reverse (3560201), we get a palindrome (4580854).

The spelling of 1020653 in words is "one million, twenty thousand, six hundred fifty-three".