550549991 has 2 divisors, whose sum is σ = 550549992. Its totient is φ = 550549990.

The previous prime is 550549957. The next prime is 550549999. The reversal of 550549991 is 199945055.

550549991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550549991 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 (550549999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275274995 + 275274996.

It is an arithmetic number, because the mean of its divisors is an integer number (275274996).

Almost surely, 2^550549991 is an apocalyptic number.

550549991 is a deficient number, since it is larger than the sum of its proper divisors (1).

550549991 is an equidigital number, since it uses as much as digits as its factorization.

550549991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 364500, while the sum is 47.

The square root of 550549991 is about 23463.8017166869. The cubic root of 550549991 is about 819.5942822396.

The spelling of 550549991 in words is "five hundred fifty million, five hundred forty-nine thousand, nine hundred ninety-one".