550138999 has 2 divisors, whose sum is σ = 550139000. Its totient is φ = 550138998.

The previous prime is 550138987. The next prime is 550139003. The reversal of 550138999 is 999831055.

It is a happy number.

550138999 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 not a de Polignac number, because 550138999 - 2⁹ = 550138487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550138949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275069499 + 275069500.

It is an arithmetic number, because the mean of its divisors is an integer number (275069500).

Almost surely, 2^550138999 is an apocalyptic number.

550138999 is a deficient number, since it is larger than the sum of its proper divisors (1).

550138999 is an equidigital number, since it uses as much as digits as its factorization.

550138999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 550138999 is about 23455.0420805421. The cubic root of 550138999 is about 819.3902859005.

The spelling of 550138999 in words is "five hundred fifty million, one hundred thirty-eight thousand, nine hundred ninety-nine".