289699391 has 2 divisors, whose sum is σ = 289699392. Its totient is φ = 289699390.

The previous prime is 289699387. The next prime is 289699439. The reversal of 289699391 is 193996982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 289699391 - 2² = 289699387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289699301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144849695 + 144849696.

It is an arithmetic number, because the mean of its divisors is an integer number (144849696).

Almost surely, 2^289699391 is an apocalyptic number.

289699391 is a deficient number, since it is larger than the sum of its proper divisors (1).

289699391 is an equidigital number, since it uses as much as digits as its factorization.

289699391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 56.

The square root of 289699391 is about 17020.5578933242. The cubic root of 289699391 is about 661.6818073619.

The spelling of 289699391 in words is "two hundred eighty-nine million, six hundred ninety-nine thousand, three hundred ninety-one".