1984996691 has 2 divisors, whose sum is σ = 1984996692. Its totient is φ = 1984996690.

The previous prime is 1984996661. The next prime is 1984996703. The reversal of 1984996691 is 1966994891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1984996691 - 2⁶ = 1984996627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1984996661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992498345 + 992498346.

It is an arithmetic number, because the mean of its divisors is an integer number (992498346).

Almost surely, 2^1984996691 is an apocalyptic number.

1984996691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984996691 is an equidigital number, since it uses as much as digits as its factorization.

1984996691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 62.

The square root of 1984996691 is about 44553.3016846114. The cubic root of 1984996691 is about 1256.7626414452.

The spelling of 1984996691 in words is "one billion, nine hundred eighty-four million, nine hundred ninety-six thousand, six hundred ninety-one".