2528561 has 4 divisors (see below), whose sum is σ = 2889792. Its totient is φ = 2167332.

The previous prime is 2528557. The next prime is 2528569. The reversal of 2528561 is 1658252.

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.

It is a cyclic number.

It is not a de Polignac number, because 2528561 - 2² = 2528557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2528569) 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, 180605 + ... + 180618.

It is an arithmetic number, because the mean of its divisors is an integer number (722448).

2^2528561 is an apocalyptic number.

It is an amenable number.

2528561 is a deficient number, since it is larger than the sum of its proper divisors (361231).

2528561 is an equidigital number, since it uses as much as digits as its factorization.

2528561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361230.

The product of its digits is 4800, while the sum is 29.

The square root of 2528561 is about 1590.1449619453. The cubic root of 2528561 is about 136.2357682298.

It can be divided in two parts, 25 and 28561, that multiplied together give a square (714025 = 845²).

The spelling of 2528561 in words is "two million, five hundred twenty-eight thousand, five hundred sixty-one".