797820019 has 2 divisors, whose sum is σ = 797820020. Its totient is φ = 797820018.

The previous prime is 797819951. The next prime is 797820029. The reversal of 797820019 is 910028797.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 797820019 - 2²⁵ = 764265587 is a prime.

It is a super-2 number, since 2×797820019² = 1273033565434320722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (797820029) 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, 398910009 + 398910010.

It is an arithmetic number, because the mean of its divisors is an integer number (398910010).

Almost surely, 2^797820019 is an apocalyptic number.

797820019 is a deficient number, since it is larger than the sum of its proper divisors (1).

797820019 is an equidigital number, since it uses as much as digits as its factorization.

797820019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 797820019 is about 28245.7079748411. The cubic root of 797820019 is about 927.4737850254.

The spelling of 797820019 in words is "seven hundred ninety-seven million, eight hundred twenty thousand, nineteen".