1998703961 has 2 divisors, whose sum is σ = 1998703962. Its totient is φ = 1998703960.

The previous prime is 1998703919. The next prime is 1998703963. The reversal of 1998703961 is 1693078991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1254505561 + 744198400 = 35419^2 + 27280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998703961 is a prime.

Together with 1998703963, 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 (1998703963) 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, 999351980 + 999351981.

It is an arithmetic number, because the mean of its divisors is an integer number (999351981).

Almost surely, 2^1998703961 is an apocalyptic number.

It is an amenable number.

1998703961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998703961 is an equidigital number, since it uses as much as digits as its factorization.

1998703961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1998703961 is about 44706.8670452314. The cubic root of 1998703961 is about 1259.6488399510.

The spelling of 1998703961 in words is "one billion, nine hundred ninety-eight million, seven hundred three thousand, nine hundred sixty-one".