1289507389 has 2 divisors, whose sum is σ = 1289507390. Its totient is φ = 1289507388.

The previous prime is 1289507353. The next prime is 1289507419. The reversal of 1289507389 is 9837059821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671587225 + 617920164 = 25915^2 + 24858^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289507389 - 2¹¹ = 1289505341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289507689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644753694 + 644753695.

It is an arithmetic number, because the mean of its divisors is an integer number (644753695).

Almost surely, 2^1289507389 is an apocalyptic number.

It is an amenable number.

1289507389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289507389 is an equidigital number, since it uses as much as digits as its factorization.

1289507389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 1289507389 is about 35909.7116251300. The cubic root of 1289507389 is about 1088.4486499079.

The spelling of 1289507389 in words is "one billion, two hundred eighty-nine million, five hundred seven thousand, three hundred eighty-nine".