1999996949 has 2 divisors, whose sum is σ = 1999996950. Its totient is φ = 1999996948.

The previous prime is 1999996931. The next prime is 1999997017. The reversal of 1999996949 is 9496999991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990498225 + 9498724 = 44615^2 + 3082^2 .

It is an emirp because it is prime and its reverse (9496999991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999996949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999993949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999998474 + 999998475.

It is an arithmetic number, because the mean of its divisors is an integer number (999998475).

Almost surely, 2^1999996949 is an apocalyptic number.

It is an amenable number.

1999996949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999996949 is an equidigital number, since it uses as much as digits as its factorization.

1999996949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114791256, while the sum is 74.

The square root of 1999996949 is about 44721.3254387658. The cubic root of 1999996949 is about 1259.9204092247.

The spelling of 1999996949 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, nine hundred forty-nine".