320577361 has 12 divisors (see below), whose sum is σ = 354839772. Its totient is φ = 287903808.

The previous prime is 320577349. The next prime is 320577391. The reversal of 320577361 is 163775023.

It can be written as a sum of positive squares in 6 ways, for example, as 78588225 + 241989136 = 8865^2 + 15556^2 .

It is not a de Polignac number, because 320577361 - 2¹³ = 320569169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320577311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8791 + ... + 26803.

It is an arithmetic number, because the mean of its divisors is an integer number (29569981).

Almost surely, 2^320577361 is an apocalyptic number.

It is an amenable number.

320577361 is a deficient number, since it is larger than the sum of its proper divisors (34262411).

320577361 is a wasteful number, since it uses less digits than its factorization.

320577361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18100 (or 18063 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 34.

The square root of 320577361 is about 17904.6742779644. The cubic root of 320577361 is about 684.4014954429.

The spelling of 320577361 in words is "three hundred twenty million, five hundred seventy-seven thousand, three hundred sixty-one".