922081921 has 16 divisors (see below), whose sum is σ = 1011660624. Its totient is φ = 836849664.

The previous prime is 922081879. The next prime is 922081931. The reversal of 922081921 is 129180229.

It can be written as a sum of positive squares in 8 ways, for example, as 87160896 + 834921025 = 9336^2 + 28895^2 .

It is a cyclic number.

It is not a de Polignac number, because 922081921 - 2⁹ = 922081409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (922081931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64591 + ... + 77563.

It is an arithmetic number, because the mean of its divisors is an integer number (63228789).

Almost surely, 2^922081921 is an apocalyptic number.

It is an amenable number.

922081921 is a deficient number, since it is larger than the sum of its proper divisors (89578703).

922081921 is a wasteful number, since it uses less digits than its factorization.

922081921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13140.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 922081921 is about 30365.8018336417. The cubic root of 922081921 is about 973.3219159411.

The spelling of 922081921 in words is "nine hundred twenty-two million, eighty-one thousand, nine hundred twenty-one".