999961939 has 2 divisors, whose sum is σ = 999961940. Its totient is φ = 999961938.

The previous prime is 999961931. The next prime is 999961943. The reversal of 999961939 is 939169999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999961939 - 2³ = 999961931 is a prime.

It is not a weakly prime, because it can be changed into another prime (999961931) 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, 499980969 + 499980970.

It is an arithmetic number, because the mean of its divisors is an integer number (499980970).

Almost surely, 2^999961939 is an apocalyptic number.

999961939 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961939 is an equidigital number, since it uses as much as digits as its factorization.

999961939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9565938, while the sum is 64.

The square root of 999961939 is about 31622.1747987073. The cubic root of 999961939 is about 999.9873128390.

The spelling of 999961939 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred thirty-nine".