921166201 has 2 divisors, whose sum is σ = 921166202. Its totient is φ = 921166200.

The previous prime is 921166187. The next prime is 921166219. The reversal of 921166201 is 102661129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889232400 + 31933801 = 29820^2 + 5651^2 .

It is an emirp because it is prime and its reverse (102661129) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921166201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921166201.

It is not a weakly prime, because it can be changed into another prime (921166291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460583100 + 460583101.

It is an arithmetic number, because the mean of its divisors is an integer number (460583101).

Almost surely, 2^921166201 is an apocalyptic number.

It is an amenable number.

921166201 is a deficient number, since it is larger than the sum of its proper divisors (1).

921166201 is an equidigital number, since it uses as much as digits as its factorization.

921166201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 921166201 is about 30350.7199420376. The cubic root of 921166201 is about 972.9996070680. Note that the first 3 decimals are identical.

The spelling of 921166201 in words is "nine hundred twenty-one million, one hundred sixty-six thousand, two hundred one".