830121791 has 2 divisors, whose sum is σ = 830121792. Its totient is φ = 830121790.

The previous prime is 830121769. The next prime is 830121823. The reversal of 830121791 is 197121038.

It is an a-pointer prime, because the next prime (830121823) can be obtained adding 830121791 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-830121791 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 (830121701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415060895 + 415060896.

It is an arithmetic number, because the mean of its divisors is an integer number (415060896).

Almost surely, 2^830121791 is an apocalyptic number.

830121791 is a deficient number, since it is larger than the sum of its proper divisors (1).

830121791 is an equidigital number, since it uses as much as digits as its factorization.

830121791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 830121791 is about 28811.8342179043. The cubic root of 830121791 is about 939.8256017941.

The spelling of 830121791 in words is "eight hundred thirty million, one hundred twenty-one thousand, seven hundred ninety-one".