797042021 has 2 divisors, whose sum is σ = 797042022. Its totient is φ = 797042020.

The previous prime is 797042017. The next prime is 797042047. The reversal of 797042021 is 120240797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 779191396 + 17850625 = 27914^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 797042021 - 2² = 797042017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797042011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398521010 + 398521011.

It is an arithmetic number, because the mean of its divisors is an integer number (398521011).

Almost surely, 2^797042021 is an apocalyptic number.

It is an amenable number.

797042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

797042021 is an equidigital number, since it uses as much as digits as its factorization.

797042021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 797042021 is about 28231.9326472702. The cubic root of 797042021 is about 927.1722101472.

The spelling of 797042021 in words is "seven hundred ninety-seven million, forty-two thousand, twenty-one".