921255017 has 2 divisors, whose sum is σ = 921255018. Its totient is φ = 921255016.

The previous prime is 921254989. The next prime is 921255059. The reversal of 921255017 is 710552129.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 918029401 + 3225616 = 30299^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 921255017 - 2¹² = 921250921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (921255217) 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 as a sum of consecutive naturals, namely, 460627508 + 460627509.

It is an arithmetic number, because the mean of its divisors is an integer number (460627509).

Almost surely, 2^921255017 is an apocalyptic number.

It is an amenable number.

921255017 is a deficient number, since it is larger than the sum of its proper divisors (1).

921255017 is an equidigital number, since it uses as much as digits as its factorization.

921255017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 921255017 is about 30352.1830681090. The cubic root of 921255017 is about 973.0308772686.

The spelling of 921255017 in words is "nine hundred twenty-one million, two hundred fifty-five thousand, seventeen".