798809591 has 2 divisors, whose sum is σ = 798809592. Its totient is φ = 798809590.

The previous prime is 798809567. The next prime is 798809623. The reversal of 798809591 is 195908897.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 798809591 - 2²² = 794615287 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 (798803591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399404795 + 399404796.

It is an arithmetic number, because the mean of its divisors is an integer number (399404796).

Almost surely, 2^798809591 is an apocalyptic number.

798809591 is a deficient number, since it is larger than the sum of its proper divisors (1).

798809591 is an equidigital number, since it uses as much as digits as its factorization.

798809591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The square root of 798809591 is about 28263.2197564255. The cubic root of 798809591 is about 927.8570890556.

The spelling of 798809591 in words is "seven hundred ninety-eight million, eight hundred nine thousand, five hundred ninety-one".