5565551 has 2 divisors, whose sum is σ = 5565552. Its totient is φ = 5565550.

The previous prime is 5565509. The next prime is 5565607. The reversal of 5565551 is 1555655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5565551 - 2¹⁰ = 5564527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5565251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2782775 + 2782776.

It is an arithmetic number, because the mean of its divisors is an integer number (2782776).

Almost surely, 2^5565551 is an apocalyptic number.

5565551 is a deficient number, since it is larger than the sum of its proper divisors (1).

5565551 is an equidigital number, since it uses as much as digits as its factorization.

5565551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18750, while the sum is 32.

The square root of 5565551 is about 2359.1420050518. The cubic root of 5565551 is about 177.2159153395.

It can be divided in two parts, 5565 and 551, that added together give a palindrome (6116).

The spelling of 5565551 in words is "five million, five hundred sixty-five thousand, five hundred fifty-one".