921716233 has 2 divisors, whose sum is σ = 921716234. Its totient is φ = 921716232.

The previous prime is 921716219. The next prime is 921716291. The reversal of 921716233 is 332617129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 916393984 + 5322249 = 30272^2 + 2307^2 .

It is a cyclic number.

It is not a de Polignac number, because 921716233 - 2²¹ = 919619081 is a prime.

It is not a weakly prime, because it can be changed into another prime (921716633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460858116 + 460858117.

It is an arithmetic number, because the mean of its divisors is an integer number (460858117).

Almost surely, 2^921716233 is an apocalyptic number.

It is an amenable number.

921716233 is a deficient number, since it is larger than the sum of its proper divisors (1).

921716233 is an equidigital number, since it uses as much as digits as its factorization.

921716233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 921716233 is about 30359.7798575681. The cubic root of 921716233 is about 973.1932291798.

The spelling of 921716233 in words is "nine hundred twenty-one million, seven hundred sixteen thousand, two hundred thirty-three".