999988949 has 2 divisors, whose sum is σ = 999988950. Its totient is φ = 999988948.

The previous prime is 999988919. The next prime is 999988961. The reversal of 999988949 is 949889999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 973876849 + 26112100 = 31207^2 + 5110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999988949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999988919) 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, 499994474 + 499994475.

It is an arithmetic number, because the mean of its divisors is an integer number (499994475).

Almost surely, 2^999988949 is an apocalyptic number.

It is an amenable number.

999988949 is a deficient number, since it is larger than the sum of its proper divisors (1).

999988949 is an equidigital number, since it uses as much as digits as its factorization.

999988949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136048896, while the sum is 74.

The square root of 999988949 is about 31622.6018695489. The cubic root of 999988949 is about 999.9963163198.

The spelling of 999988949 in words is "nine hundred ninety-nine million, nine hundred eighty-eight thousand, nine hundred forty-nine".