2563591 has 4 divisors (see below), whose sum is σ = 2567800. Its totient is φ = 2559384.

The previous prime is 2563553. The next prime is 2563601. The reversal of 2563591 is 1953652.

2563591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2563591 - 2⁹ = 2563079 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996 + ... + 2473.

It is an arithmetic number, because the mean of its divisors is an integer number (641950).

2^2563591 is an apocalyptic number.

2563591 is a deficient number, since it is larger than the sum of its proper divisors (4209).

2563591 is an equidigital number, since it uses as much as digits as its factorization.

2563591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

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

The square root of 2563591 is about 1601.1217942430. The cubic root of 2563591 is about 136.8620096371.

The spelling of 2563591 in words is "two million, five hundred sixty-three thousand, five hundred ninety-one".