550138969 has 2 divisors, whose sum is σ = 550138970. Its totient is φ = 550138968.

The previous prime is 550138957. The next prime is 550138987. The reversal of 550138969 is 969831055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303177744 + 246961225 = 17412^2 + 15715^2 .

It is a cyclic number.

It is not a de Polignac number, because 550138969 - 2⁵ = 550138937 is a prime.

It is a super-2 number, since 2×550138969² = 605305770424765922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (550138949) 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, 275069484 + 275069485.

It is an arithmetic number, because the mean of its divisors is an integer number (275069485).

Almost surely, 2^550138969 is an apocalyptic number.

It is an amenable number.

550138969 is a deficient number, since it is larger than the sum of its proper divisors (1).

550138969 is an equidigital number, since it uses as much as digits as its factorization.

550138969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 550138969 is about 23455.0414410207. The cubic root of 550138969 is about 819.3902710063.

The spelling of 550138969 in words is "five hundred fifty million, one hundred thirty-eight thousand, nine hundred sixty-nine".