999550039 has 2 divisors, whose sum is σ = 999550040. Its totient is φ = 999550038.

The previous prime is 999550033. The next prime is 999550051. The reversal of 999550039 is 930055999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999550039 - 2¹⁵ = 999517271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999549974 and 999550001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999550033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499775019 + 499775020.

It is an arithmetic number, because the mean of its divisors is an integer number (499775020).

Almost surely, 2^999550039 is an apocalyptic number.

999550039 is a deficient number, since it is larger than the sum of its proper divisors (1).

999550039 is an equidigital number, since it uses as much as digits as its factorization.

999550039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 492075, while the sum is 49.

The square root of 999550039 is about 31615.6612930997. The cubic root of 999550039 is about 999.8499904983.

The spelling of 999550039 in words is "nine hundred ninety-nine million, five hundred fifty thousand, thirty-nine".