320912261 has 16 divisors (see below), whose sum is σ = 357488640. Its totient is φ = 286680240.

The previous prime is 320912257. The next prime is 320912303. The reversal of 320912261 is 162219023.

It is a cyclic number.

It is not a de Polignac number, because 320912261 - 2² = 320912257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320912261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320912461) 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 in 15 ways as a sum of consecutive naturals, for example, 25856 + ... + 36198.

It is an arithmetic number, because the mean of its divisors is an integer number (22343040).

Almost surely, 2^320912261 is an apocalyptic number.

320912261 is the 10343-rd octagonal number.

It is an amenable number.

320912261 is a deficient number, since it is larger than the sum of its proper divisors (36576379).

320912261 is a wasteful number, since it uses less digits than its factorization.

320912261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10456.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 320912261 is about 17914.0241431120. The cubic root of 320912261 is about 684.6397388120.

The spelling of 320912261 in words is "three hundred twenty million, nine hundred twelve thousand, two hundred sixty-one".