921906563 has 2 divisors, whose sum is σ = 921906564. Its totient is φ = 921906562.

The previous prime is 921906553. The next prime is 921906577. The reversal of 921906563 is 365609129.

It is a weak prime.

It is an emirp because it is prime and its reverse (365609129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921906563 - 2¹² = 921902467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921906563.

It is not a weakly prime, because it can be changed into another prime (921906553) 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, 460953281 + 460953282.

It is an arithmetic number, because the mean of its divisors is an integer number (460953282).

Almost surely, 2^921906563 is an apocalyptic number.

921906563 is a deficient number, since it is larger than the sum of its proper divisors (1).

921906563 is an equidigital number, since it uses as much as digits as its factorization.

921906563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 921906563 is about 30362.9142705373. The cubic root of 921906563 is about 973.2602111542.

The spelling of 921906563 in words is "nine hundred twenty-one million, nine hundred six thousand, five hundred sixty-three".