5550991 has 2 divisors, whose sum is σ = 5550992. Its totient is φ = 5550990.

The previous prime is 5550973. The next prime is 5550997. The reversal of 5550991 is 1990555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5550991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5550997) 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, 2775495 + 2775496.

It is an arithmetic number, because the mean of its divisors is an integer number (2775496).

Almost surely, 2^5550991 is an apocalyptic number.

5550991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5550991 is an equidigital number, since it uses as much as digits as its factorization.

5550991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 5550991 is about 2356.0541165262. The cubic root of 5550991 is about 177.0612425992.

The spelling of 5550991 in words is "five million, five hundred fifty thousand, nine hundred ninety-one".