320912091 has 8 divisors (see below), whose sum is σ = 475425360. Its totient is φ = 213941376.

The previous prime is 320912089. The next prime is 320912129. The reversal of 320912091 is 190219023.

It is not a de Polignac number, because 320912091 - 2¹ = 320912089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 11885633 = 320912091 / (3 + 2 + 0 + 9 + 1 + 2 + 0 + 9 + 1).

It is not an unprimeable number, because it can be changed into a prime (320912021) 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, 5942790 + ... + 5942843.

It is an arithmetic number, because the mean of its divisors is an integer number (59428170).

Almost surely, 2^320912091 is an apocalyptic number.

320912091 is a deficient number, since it is larger than the sum of its proper divisors (154513269).

320912091 is a wasteful number, since it uses less digits than its factorization.

320912091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11885642 (or 11885636 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 320912091 is about 17914.0193982255. The cubic root of 320912091 is about 684.6396179183.

The spelling of 320912091 in words is "three hundred twenty million, nine hundred twelve thousand, ninety-one".