2539561 has 4 divisors (see below), whose sum is σ = 2542852. Its totient is φ = 2536272.

The previous prime is 2539543. The next prime is 2539567. The reversal of 2539561 is 1659352.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1625625 + 913936 = 1275^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2539561 - 2⁵ = 2539529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2539567) 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, 211 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (635713).

2^2539561 is an apocalyptic number.

It is an amenable number.

2539561 is a deficient number, since it is larger than the sum of its proper divisors (3291).

2539561 is a wasteful number, since it uses less digits than its factorization.

2539561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290.

The product of its digits is 8100, while the sum is 31.

The square root of 2539561 is about 1593.6000125502. The cubic root of 2539561 is about 136.4330379519.

The spelling of 2539561 in words is "two million, five hundred thirty-nine thousand, five hundred sixty-one".