999959977 has 2 divisors, whose sum is σ = 999959978. Its totient is φ = 999959976.

The previous prime is 999959929. The next prime is 999959981. The reversal of 999959977 is 779959999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 868834576 + 131125401 = 29476^2 + 11451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999959977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999950977) 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, 499979988 + 499979989.

It is an arithmetic number, because the mean of its divisors is an integer number (499979989).

Almost surely, 2^999959977 is an apocalyptic number.

It is an amenable number.

999959977 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959977 is an equidigital number, since it uses as much as digits as its factorization.

999959977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130203045, while the sum is 73.

The square root of 999959977 is about 31622.1437761579. The cubic root of 999959977 is about 999.9866588220.

The spelling of 999959977 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, nine hundred seventy-seven".