2621563 has 16 divisors (see below), whose sum is σ = 3294720. Its totient is φ = 2033856.

The previous prime is 2621551. The next prime is 2621569. The reversal of 2621563 is 3651262.

It is a cyclic number.

It is not a de Polignac number, because 2621563 - 2¹³ = 2613371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2631 + ... + 3487.

It is an arithmetic number, because the mean of its divisors is an integer number (205920).

2^2621563 is an apocalyptic number.

2621563 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2621563 is a deficient number, since it is larger than the sum of its proper divisors (673157).

2621563 is a wasteful number, since it uses less digits than its factorization.

2621563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its digits is 2160, while the sum is 25.

The square root of 2621563 is about 1619.1241459505. The cubic root of 2621563 is about 137.8859766669.

The spelling of 2621563 in words is "two million, six hundred twenty-one thousand, five hundred sixty-three".