999985949 has 2 divisors, whose sum is σ = 999985950. Its totient is φ = 999985948.

The previous prime is 999985913. The next prime is 999985957. The reversal of 999985949 is 949589999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993825625 + 6160324 = 31525^2 + 2482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999985949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999985969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499992974 + 499992975.

It is an arithmetic number, because the mean of its divisors is an integer number (499992975).

Almost surely, 2^999985949 is an apocalyptic number.

It is an amenable number.

999985949 is a deficient number, since it is larger than the sum of its proper divisors (1).

999985949 is an equidigital number, since it uses as much as digits as its factorization.

999985949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85030560, while the sum is 71.

The square root of 999985949 is about 31622.5544350864. The cubic root of 999985949 is about 999.9953163114.

The spelling of 999985949 in words is "nine hundred ninety-nine million, nine hundred eighty-five thousand, nine hundred forty-nine".