921364009 has 2 divisors, whose sum is σ = 921364010. Its totient is φ = 921364008.

The previous prime is 921363997. The next prime is 921364033. The reversal of 921364009 is 900463129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 761594409 + 159769600 = 27597^2 + 12640^2 .

It is a cyclic number.

It is not a de Polignac number, because 921364009 - 2²⁵ = 887809577 is a prime.

It is not a weakly prime, because it can be changed into another prime (921364039) 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, 460682004 + 460682005.

It is an arithmetic number, because the mean of its divisors is an integer number (460682005).

Almost surely, 2^921364009 is an apocalyptic number.

It is an amenable number.

921364009 is a deficient number, since it is larger than the sum of its proper divisors (1).

921364009 is an equidigital number, since it uses as much as digits as its factorization.

921364009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 921364009 is about 30353.9784707046. The cubic root of 921364009 is about 973.0692482580.

The spelling of 921364009 in words is "nine hundred twenty-one million, three hundred sixty-four thousand, nine".