999976961 has 2 divisors, whose sum is σ = 999976962. Its totient is φ = 999976960.

The previous prime is 999976937. The next prime is 999976963. The reversal of 999976961 is 169679999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975375361 + 24601600 = 31231^2 + 4960^2 .

It is an emirp because it is prime and its reverse (169679999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999976961 is a prime.

Together with 999976963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999976963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499988480 + 499988481.

It is an arithmetic number, because the mean of its divisors is an integer number (499988481).

Almost surely, 2^999976961 is an apocalyptic number.

It is an amenable number.

999976961 is a deficient number, since it is larger than the sum of its proper divisors (1).

999976961 is an equidigital number, since it uses as much as digits as its factorization.

999976961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14880348, while the sum is 65.

The square root of 999976961 is about 31622.4123210106. The cubic root of 999976961 is about 999.9923202744.

The spelling of 999976961 in words is "nine hundred ninety-nine million, nine hundred seventy-six thousand, nine hundred sixty-one".