2255551 has 2 divisors, whose sum is σ = 2255552. Its totient is φ = 2255550.

The previous prime is 2255549. The next prime is 2255567. The reversal of 2255551 is 1555522.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2255551 - 2¹ = 2255549 is a prime.

Together with 2255549, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2255501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127775 + 1127776.

It is an arithmetic number, because the mean of its divisors is an integer number (1127776).

2^2255551 is an apocalyptic number.

2255551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2255551 is an equidigital number, since it uses as much as digits as its factorization.

2255551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2500, while the sum is 25.

The square root of 2255551 is about 1501.8491934945. The cubic root of 2255551 is about 131.1447422158.

It can be divided in two parts, 225 and 5551, that added together give a square (5776 = 76²).

The spelling of 2255551 in words is "two million, two hundred fifty-five thousand, five hundred fifty-one".