320264561 has 4 divisors (see below), whose sum is σ = 320508324. Its totient is φ = 320020800.

The previous prime is 320264557. The next prime is 320264569. The reversal of 320264561 is 165462023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 217120225 + 103144336 = 14735^2 + 10156^2 .

It is a cyclic number.

It is not a de Polignac number, because 320264561 - 2² = 320264557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320264569) 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, 119900 + ... + 122541.

It is an arithmetic number, because the mean of its divisors is an integer number (80127081).

Almost surely, 2^320264561 is an apocalyptic number.

It is an amenable number.

320264561 is a deficient number, since it is larger than the sum of its proper divisors (243763).

320264561 is a wasteful number, since it uses less digits than its factorization.

320264561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243762.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 320264561 is about 17895.9369969834. The cubic root of 320264561 is about 684.1788238087.

The spelling of 320264561 in words is "three hundred twenty million, two hundred sixty-four thousand, five hundred sixty-one".