1996939961 has 2 divisors, whose sum is σ = 1996939962. Its totient is φ = 1996939960.

The previous prime is 1996939951. The next prime is 1996939963. The reversal of 1996939961 is 1699396991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1968253225 + 28686736 = 44365^2 + 5356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1996939961 is a prime.

Together with 1996939963, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1996939894 and 1996939903.

It is not a weakly prime, because it can be changed into another prime (1996939963) 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, 998469980 + 998469981.

It is an arithmetic number, because the mean of its divisors is an integer number (998469981).

Almost surely, 2^1996939961 is an apocalyptic number.

It is an amenable number.

1996939961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996939961 is an equidigital number, since it uses as much as digits as its factorization.

1996939961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6377292, while the sum is 62.

The square root of 1996939961 is about 44687.1341775236. The cubic root of 1996939961 is about 1259.2781539773.

The spelling of 1996939961 in words is "one billion, nine hundred ninety-six million, nine hundred thirty-nine thousand, nine hundred sixty-one".