289999649 has 2 divisors, whose sum is σ = 289999650. Its totient is φ = 289999648.

The previous prime is 289999631. The next prime is 289999669. The reversal of 289999649 is 946999982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254083600 + 35916049 = 15940^2 + 5993^2 .

It is a cyclic number.

It is not a de Polignac number, because 289999649 - 2⁸ = 289999393 is a prime.

It is not a weakly prime, because it can be changed into another prime (289999609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144999824 + 144999825.

It is an arithmetic number, because the mean of its divisors is an integer number (144999825).

Almost surely, 2^289999649 is an apocalyptic number.

It is an amenable number.

289999649 is a deficient number, since it is larger than the sum of its proper divisors (1).

289999649 is an equidigital number, since it uses as much as digits as its factorization.

289999649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22674816, while the sum is 65.

The square root of 289999649 is about 17029.3760602084. The cubic root of 289999649 is about 661.9103277558.

The spelling of 289999649 in words is "two hundred eighty-nine million, nine hundred ninety-nine thousand, six hundred forty-nine".