1002561 has 8 divisors (see below), whose sum is σ = 1527744. Its totient is φ = 572880.

The previous prime is 1002553. The next prime is 1002569. The reversal of 1002561 is 1652001.

It is an interprime number because it is at equal distance from previous prime (1002553) and next prime (1002569).

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

It is not a de Polignac number, because 1002561 - 2³ = 1002553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002561.

It is not an unprimeable number, because it can be changed into a prime (1002569) 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, 23850 + ... + 23891.

It is an arithmetic number, because the mean of its divisors is an integer number (190968).

2^1002561 is an apocalyptic number.

It is an amenable number.

1002561 is a deficient number, since it is larger than the sum of its proper divisors (525183).

1002561 is an equidigital number, since it uses as much as digits as its factorization.

1002561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47751.

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

The square root of 1002561 is about 1001.2796812080. The cubic root of 1002561 is about 100.0852938955.

Adding to 1002561 its reverse (1652001), we get a palindrome (2654562).

The spelling of 1002561 in words is "one million, two thousand, five hundred sixty-one".