320921911 has 2 divisors, whose sum is σ = 320921912. Its totient is φ = 320921910.

The previous prime is 320921899. The next prime is 320921929. The reversal of 320921911 is 119129023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320921911 - 2⁵ = 320921879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320921911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320921011) 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, 160460955 + 160460956.

It is an arithmetic number, because the mean of its divisors is an integer number (160460956).

Almost surely, 2^320921911 is an apocalyptic number.

320921911 is a deficient number, since it is larger than the sum of its proper divisors (1).

320921911 is an equidigital number, since it uses as much as digits as its factorization.

320921911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 320921911 is about 17914.2934831380. The cubic root of 320921911 is about 684.6466012352.

The spelling of 320921911 in words is "three hundred twenty million, nine hundred twenty-one thousand, nine hundred eleven".