550991603 has 2 divisors, whose sum is σ = 550991604. Its totient is φ = 550991602.

The previous prime is 550991593. The next prime is 550991681. The reversal of 550991603 is 306199055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 550991603 - 2⁸ = 550991347 is a prime.

It is not a weakly prime, because it can be changed into another prime (550951603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275495801 + 275495802.

It is an arithmetic number, because the mean of its divisors is an integer number (275495802).

Almost surely, 2^550991603 is an apocalyptic number.

550991603 is a deficient number, since it is larger than the sum of its proper divisors (1).

550991603 is an equidigital number, since it uses as much as digits as its factorization.

550991603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 550991603 is about 23473.2103258161. The cubic root of 550991603 is about 819.8133637305.

The spelling of 550991603 in words is "five hundred fifty million, nine hundred ninety-one thousand, six hundred three".