2012561 has 4 divisors (see below), whose sum is σ = 2025072. Its totient is φ = 2000052.

The previous prime is 2012533. The next prime is 2012597. The reversal of 2012561 is 1652102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1652102 = 2 ⋅826051.

It is a cyclic number.

It is not a de Polignac number, because 2012561 - 2¹⁴ = 1996177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2012531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6011 + ... + 6336.

It is an arithmetic number, because the mean of its divisors is an integer number (506268).

2^2012561 is an apocalyptic number.

It is an amenable number.

2012561 is a deficient number, since it is larger than the sum of its proper divisors (12511).

2012561 is a wasteful number, since it uses less digits than its factorization.

2012561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12510.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2012561 is about 1418.6475954232. The cubic root of 2012561 is about 126.2553191890.

Adding to 2012561 its reverse (1652102), we get a palindrome (3664663).

The spelling of 2012561 in words is "two million, twelve thousand, five hundred sixty-one".