5565991 has 2 divisors, whose sum is σ = 5565992. Its totient is φ = 5565990.

The previous prime is 5565983. The next prime is 5565997. The reversal of 5565991 is 1995655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5565991 - 2³ = 5565983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5565997) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2782995 + 2782996.

It is an arithmetic number, because the mean of its divisors is an integer number (2782996).

Almost surely, 2^5565991 is an apocalyptic number.

5565991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5565991 is an equidigital number, since it uses as much as digits as its factorization.

5565991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60750, while the sum is 40.

The square root of 5565991 is about 2359.2352574510. The cubic root of 5565991 is about 177.2205853143.

It can be divided in two parts, 5565 and 991, that added together give a palindrome (6556).

The spelling of 5565991 in words is "five million, five hundred sixty-five thousand, nine hundred ninety-one".