320261 has 4 divisors (see below), whose sum is σ = 330624. Its totient is φ = 309900.

The previous prime is 320239. The next prime is 320267. The reversal of 320261 is 162023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320261 - 2¹⁰ = 319237 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 (320267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5135 + ... + 5196.

It is an arithmetic number, because the mean of its divisors is an integer number (82656).

2³²⁰²⁶¹ is an apocalyptic number.

320261 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

320261 is a deficient number, since it is larger than the sum of its proper divisors (10363).

320261 is a wasteful number, since it uses less digits than its factorization.

320261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10362.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 320261 is about 565.9160715159. The cubic root of 320261 is about 68.4176288020.

Adding to 320261 its reverse (162023), we get a palindrome (482284).

The spelling of 320261 in words is "three hundred twenty thousand, two hundred sixty-one".