922221991 has 2 divisors, whose sum is σ = 922221992. Its totient is φ = 922221990.

The previous prime is 922221959. The next prime is 922221997. The reversal of 922221991 is 199122229.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 922221991 - 2⁵ = 922221959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 922221991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (922221997) 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, 461110995 + 461110996.

It is an arithmetic number, because the mean of its divisors is an integer number (461110996).

Almost surely, 2^922221991 is an apocalyptic number.

922221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

922221991 is an equidigital number, since it uses as much as digits as its factorization.

922221991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 922221991 is about 30368.1081234903. The cubic root of 922221991 is about 973.3711980041.

It can be divided in two parts, 9222 and 21991, that added together give a palindrome (31213).

The spelling of 922221991 in words is "nine hundred twenty-two million, two hundred twenty-one thousand, nine hundred ninety-one".