1997675689 has 2 divisors, whose sum is σ = 1997675690. Its totient is φ = 1997675688.

The previous prime is 1997675683. The next prime is 1997675699. The reversal of 1997675689 is 9865767991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1452219664 + 545456025 = 38108^2 + 23355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997675689 - 2¹¹ = 1997673641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1997675683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998837844 + 998837845.

It is an arithmetic number, because the mean of its divisors is an integer number (998837845).

Almost surely, 2^1997675689 is an apocalyptic number.

It is an amenable number.

1997675689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997675689 is an equidigital number, since it uses as much as digits as its factorization.

1997675689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51438240, while the sum is 67.

The square root of 1997675689 is about 44695.3654085074. The cubic root of 1997675689 is about 1259.4327859739.

The spelling of 1997675689 in words is "one billion, nine hundred ninety-seven million, six hundred seventy-five thousand, six hundred eighty-nine".