830991779 has 2 divisors, whose sum is σ = 830991780. Its totient is φ = 830991778.

The previous prime is 830991701. The next prime is 830991803. The reversal of 830991779 is 977199038.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 830991779 - 2⁸ = 830991523 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 830991779.

It is not a weakly prime, because it can be changed into another prime (830991079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415495889 + 415495890.

It is an arithmetic number, because the mean of its divisors is an integer number (415495890).

Almost surely, 2^830991779 is an apocalyptic number.

830991779 is a deficient number, since it is larger than the sum of its proper divisors (1).

830991779 is an equidigital number, since it uses as much as digits as its factorization.

830991779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 830991779 is about 28826.9280187813. The cubic root of 830991779 is about 940.1538072599.

The spelling of 830991779 in words is "eight hundred thirty million, nine hundred ninety-one thousand, seven hundred seventy-nine".