550138949 has 2 divisors, whose sum is σ = 550138950. Its totient is φ = 550138948.

The previous prime is 550138937. The next prime is 550138957. The reversal of 550138949 is 949831055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511076449 + 39062500 = 22607^2 + 6250^2 .

It is a cyclic number.

It is not a de Polignac number, because 550138949 - 2⁴ = 550138933 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 (550138969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275069474 + 275069475.

It is an arithmetic number, because the mean of its divisors is an integer number (275069475).

Almost surely, 2^550138949 is an apocalyptic number.

It is an amenable number.

550138949 is a deficient number, since it is larger than the sum of its proper divisors (1).

550138949 is an equidigital number, since it uses as much as digits as its factorization.

550138949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 550138949 is about 23455.0410146732. The cubic root of 550138949 is about 819.3902610768.

The spelling of 550138949 in words is "five hundred fifty million, one hundred thirty-eight thousand, nine hundred forty-nine".