922221997 has 2 divisors, whose sum is σ = 922221998. Its totient is φ = 922221996.

The previous prime is 922221991. The next prime is 922222013. The reversal of 922221997 is 799122229.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 681940996 + 240281001 = 26114^2 + 15501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-922221997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (922221991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461110998 + 461110999.

It is an arithmetic number, because the mean of its divisors is an integer number (461110999).

Almost surely, 2^922221997 is an apocalyptic number.

It is an amenable number.

922221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

922221997 is an equidigital number, since it uses as much as digits as its factorization.

922221997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 922221997 is about 30368.1082222782. The cubic root of 922221997 is about 973.3712001151.

The spelling of 922221997 in words is "nine hundred twenty-two million, two hundred twenty-one thousand, nine hundred ninety-seven".