1121665289 has 2 divisors, whose sum is σ = 1121665290. Its totient is φ = 1121665288.

The previous prime is 1121665273. The next prime is 1121665319. The reversal of 1121665289 is 9825661211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 904986889 + 216678400 = 30083^2 + 14720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121665289 - 2⁴ = 1121665273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121665789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560832644 + 560832645.

It is an arithmetic number, because the mean of its divisors is an integer number (560832645).

Almost surely, 2^1121665289 is an apocalyptic number.

It is an amenable number.

1121665289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121665289 is an equidigital number, since it uses as much as digits as its factorization.

1121665289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 1121665289 is about 33491.2718331209. The cubic root of 1121665289 is about 1039.0132680610.

The spelling of 1121665289 in words is "one billion, one hundred twenty-one million, six hundred sixty-five thousand, two hundred eighty-nine".