288919391 has 2 divisors, whose sum is σ = 288919392. Its totient is φ = 288919390.

The previous prime is 288919381. The next prime is 288919457. The reversal of 288919391 is 193919882.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 288919391 - 2¹⁰ = 288918367 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (288919381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144459695 + 144459696.

It is an arithmetic number, because the mean of its divisors is an integer number (144459696).

Almost surely, 2^288919391 is an apocalyptic number.

288919391 is a deficient number, since it is larger than the sum of its proper divisors (1).

288919391 is an equidigital number, since it uses as much as digits as its factorization.

288919391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 50.

The square root of 288919391 is about 16997.6289817139. The cubic root of 288919391 is about 661.0874260584.

The spelling of 288919391 in words is "two hundred eighty-eight million, nine hundred nineteen thousand, three hundred ninety-one".