2555643 has 4 divisors (see below), whose sum is σ = 3407528. Its totient is φ = 1703760.

The previous prime is 2555639. The next prime is 2555647. The reversal of 2555643 is 3465552.

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

It is an interprime number because it is at equal distance from previous prime (2555639) and next prime (2555647).

It is not a de Polignac number, because 2555643 - 2² = 2555639 is a prime.

It is a super-2 number, since 2×2555643² = 13062622286898, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2555643.

It is not an unprimeable number, because it can be changed into a prime (2555647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425938 + ... + 425943.

It is an arithmetic number, because the mean of its divisors is an integer number (851882).

2^2555643 is an apocalyptic number.

2555643 is a deficient number, since it is larger than the sum of its proper divisors (851885).

2555643 is an equidigital number, since it uses as much as digits as its factorization.

2555643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851884.

The product of its digits is 18000, while the sum is 30.

The square root of 2555643 is about 1598.6378576776. The cubic root of 2555643 is about 136.7204236933.

Subtracting 2555643 from its reverse (3465552), we obtain a palindrome (909909).

The spelling of 2555643 in words is "two million, five hundred fifty-five thousand, six hundred forty-three".