791879294021 has 2 divisors, whose sum is σ = 791879294022. Its totient is φ = 791879294020.

The previous prime is 791879293981. The next prime is 791879294027. The reversal of 791879294021 is 120492978197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725629681921 + 66249612100 = 851839^2 + 257390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-791879294021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (791879294027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395939647010 + 395939647011.

It is an arithmetic number, because the mean of its divisors is an integer number (395939647011).

Almost surely, 2^791879294021 is an apocalyptic number.

It is an amenable number.

791879294021 is a deficient number, since it is larger than the sum of its proper divisors (1).

791879294021 is an equidigital number, since it uses as much as digits as its factorization.

791879294021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 59.

The spelling of 791879294021 in words is "seven hundred ninety-one billion, eight hundred seventy-nine million, two hundred ninety-four thousand, twenty-one".