1989280697 has 2 divisors, whose sum is σ = 1989280698. Its totient is φ = 1989280696.

The previous prime is 1989280693. The next prime is 1989280717. The reversal of 1989280697 is 7960829891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988803216 + 477481 = 44596^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989280697 - 2² = 1989280693 is a prime.

It is not a weakly prime, because it can be changed into another prime (1989280693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994640348 + 994640349.

It is an arithmetic number, because the mean of its divisors is an integer number (994640349).

Almost surely, 2^1989280697 is an apocalyptic number.

It is an amenable number.

1989280697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989280697 is an equidigital number, since it uses as much as digits as its factorization.

1989280697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The square root of 1989280697 is about 44601.3530848561. The cubic root of 1989280697 is about 1257.6661039273. Note that the first 3 decimals are identical.

The spelling of 1989280697 in words is "one billion, nine hundred eighty-nine million, two hundred eighty thousand, six hundred ninety-seven".