2002561 has 8 divisors (see below), whose sum is σ = 2195424. Its totient is φ = 1811520.

The previous prime is 2002547. The next prime is 2002577. The reversal of 2002561 is 1652002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2002561 - 2¹⁹ = 1478273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2002531) 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, 3081 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (274428).

2^2002561 is an apocalyptic number.

It is an amenable number.

2002561 is a deficient number, since it is larger than the sum of its proper divisors (192863).

2002561 is a wasteful number, since it uses less digits than its factorization.

2002561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2002561 is about 1415.1187229346. The cubic root of 2002561 is about 126.0458596819.

Adding to 2002561 its reverse (1652002), we get a palindrome (3654563).

The spelling of 2002561 in words is "two million, two thousand, five hundred sixty-one".