320991011 has 8 divisors (see below), whose sum is σ = 352108848. Its totient is φ = 290196000.

The previous prime is 320990987. The next prime is 320991017. The reversal of 320991011 is 110199023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320991011 - 2¹⁴ = 320974627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320991017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78620 + ... + 82601.

It is an arithmetic number, because the mean of its divisors is an integer number (44013606).

Almost surely, 2^320991011 is an apocalyptic number.

320991011 is a deficient number, since it is larger than the sum of its proper divisors (31117837).

320991011 is a wasteful number, since it uses less digits than its factorization.

320991011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161413.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 320991011 is about 17916.2220068853. Note that the first 3 decimals coincide. The cubic root of 320991011 is about 684.6957364334.

The spelling of 320991011 in words is "three hundred twenty million, nine hundred ninety-one thousand, eleven".