1230640289 has 2 divisors, whose sum is σ = 1230640290. Its totient is φ = 1230640288.

The previous prime is 1230640273. The next prime is 1230640357. The reversal of 1230640289 is 9820460321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1172377600 + 58262689 = 34240^2 + 7633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230640289 - 2⁴ = 1230640273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1230643289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615320144 + 615320145.

It is an arithmetic number, because the mean of its divisors is an integer number (615320145).

Almost surely, 2^1230640289 is an apocalyptic number.

It is an amenable number.

1230640289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230640289 is an equidigital number, since it uses as much as digits as its factorization.

1230640289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1230640289 is about 35080.4830211900. The cubic root of 1230640289 is about 1071.6271539870.

The spelling of 1230640289 in words is "one billion, two hundred thirty million, six hundred forty thousand, two hundred eighty-nine".