1289025289 has 4 divisors (see below), whose sum is σ = 1364850324. Its totient is φ = 1213200256.

The previous prime is 1289025251. The next prime is 1289025293. The reversal of 1289025289 is 9825209821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9825209821 = 7 ⋅1403601403.

It can be written as a sum of positive squares in 2 ways, for example, as 391723264 + 897302025 = 19792^2 + 29955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289025289 - 2⁷ = 1289025161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289025989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37912492 + ... + 37912525.

It is an arithmetic number, because the mean of its divisors is an integer number (341212581).

Almost surely, 2^1289025289 is an apocalyptic number.

It is an amenable number.

1289025289 is a deficient number, since it is larger than the sum of its proper divisors (75825035).

1289025289 is an equidigital number, since it uses as much as digits as its factorization.

1289025289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75825034.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 1289025289 is about 35902.9983288304. The cubic root of 1289025289 is about 1088.3129891882.

The spelling of 1289025289 in words is "one billion, two hundred eighty-nine million, twenty-five thousand, two hundred eighty-nine".