822009997 has 2 divisors, whose sum is σ = 822009998. Its totient is φ = 822009996.

The previous prime is 822009983. The next prime is 822010073. The reversal of 822009997 is 799900228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583029316 + 238980681 = 24146^2 + 15459^2 .

It is a cyclic number.

It is not a de Polignac number, because 822009997 - 2¹⁵ = 821977229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822009907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411004998 + 411004999.

It is an arithmetic number, because the mean of its divisors is an integer number (411004999).

Almost surely, 2^822009997 is an apocalyptic number.

It is an amenable number.

822009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

822009997 is an equidigital number, since it uses as much as digits as its factorization.

822009997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 822009997 is about 28670.7167158409. The cubic root of 822009997 is about 936.7543095987.

The spelling of 822009997 in words is "eight hundred twenty-two million, nine thousand, nine hundred ninety-seven".