996609961 has 2 divisors, whose sum is σ = 996609962. Its totient is φ = 996609960.

The previous prime is 996609947. The next prime is 996610003. The reversal of 996609961 is 169906699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578162025 + 418447936 = 24045^2 + 20456^2 .

It is an emirp because it is prime and its reverse (169906699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-996609961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (996609161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498304980 + 498304981.

It is an arithmetic number, because the mean of its divisors is an integer number (498304981).

Almost surely, 2^996609961 is an apocalyptic number.

It is an amenable number.

996609961 is a deficient number, since it is larger than the sum of its proper divisors (1).

996609961 is an equidigital number, since it uses as much as digits as its factorization.

996609961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417176, while the sum is 55.

The square root of 996609961 is about 31569.1298739766. The cubic root of 996609961 is about 998.8687076603.

The spelling of 996609961 in words is "nine hundred ninety-six million, six hundred nine thousand, nine hundred sixty-one".