320106991 has 8 divisors (see below), whose sum is σ = 339401664. Its totient is φ = 300864000.

The previous prime is 320106937. The next prime is 320107057. The reversal of 320106991 is 199601023.

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 320106991 - 2¹⁷ = 319975919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320106191) 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, 231 + ... + 25303.

It is an arithmetic number, because the mean of its divisors is an integer number (42425208).

Almost surely, 2^320106991 is an apocalyptic number.

320106991 is a deficient number, since it is larger than the sum of its proper divisors (19294673).

320106991 is a wasteful number, since it uses less digits than its factorization.

320106991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25841.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 320106991 is about 17891.5340594372. The cubic root of 320106991 is about 684.0666001917.

The spelling of 320106991 in words is "three hundred twenty million, one hundred six thousand, nine hundred ninety-one".