1289429649 has 6 divisors (see below), whose sum is σ = 1862509506. Its totient is φ = 859619760.

The previous prime is 1289429641. The next prime is 1289429663. The reversal of 1289429649 is 9469249821.

It can be written as a sum of positive squares in only one way, i.e., 1046069649 + 243360000 = 32343^2 + 15600^2 .

It is not a de Polignac number, because 1289429649 - 2³ = 1289429641 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1289429595 and 1289429604.

It is not an unprimeable number, because it can be changed into a prime (1289429641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71634972 + ... + 71634989.

It is an arithmetic number, because the mean of its divisors is an integer number (310418251).

Almost surely, 2^1289429649 is an apocalyptic number.

It is an amenable number.

1289429649 is a deficient number, since it is larger than the sum of its proper divisors (573079857).

1289429649 is a wasteful number, since it uses less digits than its factorization.

1289429649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143269967 (or 143269964 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 1289429649 is about 35908.6291718300. The cubic root of 1289429649 is about 1088.4267765168.

The spelling of 1289429649 in words is "one billion, two hundred eighty-nine million, four hundred twenty-nine thousand, six hundred forty-nine".