1289589121 has 2 divisors, whose sum is σ = 1289589122. Its totient is φ = 1289589120.

The previous prime is 1289589107. The next prime is 1289589143. The reversal of 1289589121 is 1219859821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013530896 + 276058225 = 31836^2 + 16615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289589121 - 2⁵ = 1289589089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1289586121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644794560 + 644794561.

It is an arithmetic number, because the mean of its divisors is an integer number (644794561).

Almost surely, 2^1289589121 is an apocalyptic number.

It is an amenable number.

1289589121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289589121 is an equidigital number, since it uses as much as digits as its factorization.

1289589121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 46.

The square root of 1289589121 is about 35910.8496279328. The cubic root of 1289589121 is about 1088.4716455641.

The spelling of 1289589121 in words is "one billion, two hundred eighty-nine million, five hundred eighty-nine thousand, one hundred twenty-one".