1289430125 has 16 divisors (see below), whose sum is σ = 1611775152. Its totient is φ = 1029899200.

The previous prime is 1289430119. The next prime is 1289430137. The reversal of 1289430125 is 5210349821.

It can be written as a sum of positive squares in 8 ways, for example, as 444830281 + 844599844 = 21091^2 + 29062^2 .

It is not a de Polignac number, because 1289430125 - 2⁶ = 1289430061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73727 + ... + 89523.

It is an arithmetic number, because the mean of its divisors is an integer number (100735947).

Almost surely, 2^1289430125 is an apocalyptic number.

It is an amenable number.

1289430125 is a deficient number, since it is larger than the sum of its proper divisors (322345027).

1289430125 is an equidigital number, since it uses as much as digits as its factorization.

1289430125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16465 (or 16455 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1289430125 is about 35908.6357997627. The cubic root of 1289430125 is about 1088.4269104496.

Adding to 1289430125 its reverse (5210349821), we get a palindrome (6499779946).

The spelling of 1289430125 in words is "one billion, two hundred eighty-nine million, four hundred thirty thousand, one hundred twenty-five".