797617921 has 2 divisors, whose sum is σ = 797617922. Its totient is φ = 797617920.

The previous prime is 797617903. The next prime is 797617927. The reversal of 797617921 is 129716797.

797617921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636048400 + 161569521 = 25220^2 + 12711^2 .

It is a cyclic number.

It is not a de Polignac number, because 797617921 - 2¹⁷ = 797486849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (797617927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398808960 + 398808961.

It is an arithmetic number, because the mean of its divisors is an integer number (398808961).

Almost surely, 2^797617921 is an apocalyptic number.

It is an amenable number.

797617921 is a deficient number, since it is larger than the sum of its proper divisors (1).

797617921 is an equidigital number, since it uses as much as digits as its factorization.

797617921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 333396, while the sum is 49.

The square root of 797617921 is about 28242.1302489738. The cubic root of 797617921 is about 927.3954647603.

The spelling of 797617921 in words is "seven hundred ninety-seven million, six hundred seventeen thousand, nine hundred twenty-one".